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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2022
Apr. 30, 2022
Supplemental type certificates, accumulated amortization $ 9,681 $ 9,336
Other assets, accumulated amortization $ 11,745 $ 11,575
Preferred stock, par value (in dollars per share) $ 5 $ 5
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 80,673,572 80,348,572
Common stock, shares outstanding (in shares) 76,781,507 76,458,146
Treasury stock, shares (in shares) 3,892,065 3,890,426
Preferred Class A [Member]    
Preferred stock, stated value (in dollars per share) $ 100 $ 100
Preferred stock, dividend rate 9.80% 9.80%
Preferred stock, liquidation value $ 100 $ 100
Preferred stock, redemption value $ 100 $ 100
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, designated classes (in shares) 200,000 200,000
Preferred Class B [Member]    
Preferred stock, stated value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, dividend rate 6.00% 6.00%
Preferred stock, liquidation value $ 1,000 $ 1,000
Preferred stock, redemption value $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, designated classes (in shares) 200,000 200,000