SEC Filings

Filing date	Form	Description	View
Mar 02, 2017	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 0000046619-17-000009.pdf 0000046619-17-000009.xls EX-101.INS - XBRL INSTANCE DOCUMENT
May 25, 2017	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 0000046619-17-000032.pdf 0000046619-17-000032.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Aug 25, 2017	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 0000046619-17-000042.pdf 0000046619-17-000042.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 28, 2019	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 1.31.19 HEI Form 10Q.pdf 935.7 KB 0000046619-19-000017.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
May 30, 2019	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 4.30.19 HEI Form 10Q.pdf 1 MB 0000046619-19-000039.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
Aug 29, 2019	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 7.31.19 HEI Form 10Q.pdf 1 MB 0000046619-19-000061.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
Feb 27, 2020	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 1.31.20 HEI Form 10Q.pdf 877.5 KB 0000046619-20-000006.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
May 28, 2020	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 4.30.20 HEI Form 10Q.pdf 578.9 KB 0000046619-20-000018.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Aug 27, 2020	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML Q3-2020-08-27-16-46.cleaned.pdf 607.2 KB 0000046619-20-000044.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Feb 25, 2021	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML Q1-2021-02-25-15-23.cleaned.pdf 488.4 KB 0000046619-21-000021.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
May 27, 2021	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 2021.4.30 10Q-2021-05-27-14-40.cleaned.pdf 537.7 KB 0000046619-21-000035.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Aug 26, 2021	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 7.31.21 10Q-2021-08-26-16-06.pdf 543.5 KB 0000046619-21-000039.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Feb 25, 2022	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 01.31.2022 10Q-2022-02-25-15-37.pdf 546.4 KB 0000046619-22-000008.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
May 25, 2022	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML Q2-2022-05-25.pdf 0000046619-22-000030.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Aug 31, 2022	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 7.31.22 10Q-2022-08-31-15-17.pdf 0000046619-22-000042.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Mar 01, 2023	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 01.31.2023 10Q-2023-03-01-15-26.pdf 0000046619-23-000052.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
May 24, 2023	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 4.30.23 10Q-2023-05-24-16-07.pdf 0000046619-23-000083.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Aug 30, 2023	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 0000046619-23-000125.pdf 0000046619-23-000125.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Feb 28, 2024	10-Q	Quarterly report which provides a continuing view of a company's financial position	View HTML 01.31.2024 10Q-2024-02-28-16-54.pdf 577.4 KB 0000046619-24-000014.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
May 02, 1995	10-Q/A	Amendment to a previously filed 10-Q	View HTML 0000950170-95-000048.pdf 0000950170-95-000048.xls
Apr 12, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000069.pdf
Sep 12, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000126.pdf
Oct 17, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000133.pdf
Dec 26, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000164.pdf 0000046619-23-000164.xls
Dec 27, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000165.pdf

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