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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jan. 31, 2020
Apr. 30, 2019
Supplemental type certificates, accumulated amortization $ 6,782 $ 6,054
Other assets, accumulated amortization $ 9,967 $ 9,370
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) 71,008,122 71,008,122
Common stock, shares outstanding (in shares) 67,686,732 68,281,071
Treasury stock, shares (in shares) 3,321,390 2,727,051
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