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Note 2 - Debt - Schedule of Debt (Details) (Parentheticals) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Notes Collateralized by Aircraft Security Agreements, Due January 2020 [Member]    
Interest rate 5.75% 5.75%
Maturity date Jan. 31, 2020 Jan. 31, 2020
Notes Collateralized by Aircraft Security Agreements, Due January 2023 [Member]    
Interest rate 6.25% 6.25%
Maturity date Jan. 31, 2023 Jan. 31, 2023
Note Collateralized by Real Estate Due June 2024 [Member]    
Interest rate 6.25% 6.25%
Maturity date Jun. 30, 2024 Jun. 30, 2024
Note Collateralized by BNSC's Assets and Compensation due under State Management Contract Due May 2020 [Member]    
Interest rate 4.89% 4.89%
Maturity date May 31, 2020 May 31, 2020
Note Collateralized by Equipment Due April 2022 [Member]    
Interest rate 4.50% 4.50%
Maturity date Apr. 30, 2022 Apr. 30, 2022
Note One Collateralized by Real Estate Due March 2029 [Member]    
Maturity date Mar. 31, 2029  
Note One Collateralized by Real Estate Due March 2029 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Basis spread 1.75%  
Note Two Collateralized by Real Estate Due March 2029 [Member]    
Maturity date Mar. 31, 2029  
Note Two Collateralized by Real Estate Due March 2029 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Basis spread 1.75%  
Note Collateralized by Real Estate [Member]    
Borrowing capacity $ 5 $ 5
Basis spread 3.40% 3.40%