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Note 12 - Senior Notes and Credit Facilities - Senior Notes and Credit Facilities Balances (Details) (Parentheticals)
 9 Months Ended 12 Months Ended
Jul. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Mar. 25, 2020
Jan. 31, 2020
Dec. 10, 2019
Jan. 15, 2019
Feb. 01, 2018
Jul. 27, 2017
Senior Unsecured Term Loan Credit Facility Due 2027 [Member]                  
Debt Instrument, Maturity Date Feb. 01, 2027 Feb. 01, 2027              
The 10.0% 2022 Notes [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 10.00% 10.00%   10.00% 10.00% 10.00%     10.00%
Debt Instrument, Maturity Date Jul. 15, 2022 Jul. 15, 2022              
The 10.5% 2024 Notes [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 10.50% 10.50%     10.50% 10.50% 10.50%    
Debt Instrument, Maturity Date Jul. 15, 2024 Jul. 15, 2024              
The 10.0% Senior Secured 1.75 Lien Notes due 2025 [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 10.00% 10.00%     10.00% 10.00%      
Debt Instrument, Maturity Date Nov. 15, 2025 Nov. 15, 2025              
The 7.75% Senior Secured 1.125 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 7.75% 7.75%              
Debt Instrument, Maturity Date Feb. 15, 2026 Feb. 15, 2026              
The 10.5% Senior Secured 1.25 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 10.50% 10.50%              
Debt Instrument, Maturity Date Feb. 15, 2026 Feb. 15, 2026              
The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage   11.25%   11.25%          
The 11.25% Senior Secured 1.5 Lien Notes due February 15, 2026 [Member] | Senior Secured Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 11.25% 11.25%              
Debt Instrument, Maturity Date Feb. 15, 2026 Feb. 15, 2026              
The 8.0% Senior Notes Due 2027 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage     8.00%         8.00%  
The 8.0% Senior Notes Due 2027 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage [1] 8.00% 8.00%              
Debt Instrument, Maturity Date [1] Nov. 01, 2027 Nov. 01, 2027              
The 13.5% Senior Notes Due 2026 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage               13.50%  
The 13.5% Senior Notes Due 2026 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 13.50% 13.50%              
Debt Instrument, Maturity Date Feb. 01, 2026 Feb. 01, 2026              
The 5.0% Senior Notes due 2040 [Member]                  
Debt Instrument, Interest Rate, Stated Percentage               5.00%  
The 5.0% Senior Notes due 2040 [Member] | Unsecured Senior Notes Excluding Senior Amortizing Notes and Senior Exchangeable Notes [Member]                  
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%              
Debt Instrument, Maturity Date Feb. 01, 2040 Feb. 01, 2040              
The 10.0% Senior Secured 1.75 Lien Term Loans Due 2028 [Member] | Senior Secured Term Loan [Member]                  
Debt Instrument, Maturity Date Jan. 31, 2028                
[1] $26.0 million of 8.0% Senior Notes are owned by a wholly-owned consolidated subsidiary of HEI. Therefore, in accordance with GAAP, such notes are not reflected on the Condensed Consolidated Balance Sheets of HEI. On November 1, 2019, the maturity of the 8.0% Senior Notes was extended to November 1, 2027.