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Note 1 - Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic    
Continuing operations (loss) earnings $ (36,483) $ 10,049
Deduct preferred stock dividends 23 23
Undistributed (loss) earnings (36,506) 10,026
(Loss) earnings attributable to participating preferred shareholders (143) 48
(Loss) earnings attributable to common shareholders $ (36,363) $ 9,978
Weighted average common shares outstanding (in shares) 9,652 9,769
Basic (loss) earnings from continuing operations per common share (in dollars per share) $ (3.77) $ 1.02
Diluted    
(Loss) earnings attributable to common shareholders $ (36,363) $ 9,978
Add dividends on convertible preferred stock 20
(Loss) earnings attributable to common stock on a diluted basis $ (36,363) $ 9,998
Weighted average common shares outstanding (in shares) 9,652 9,769
Additional shares to be issued related to the equity compensation plan (in shares) 3
Additional shares to be issued under full conversion of preferred stock (in shares) 67
Total shares for diluted (in shares) 9,652 9,839
Diluted (loss) earnings from continuing operations per share (in dollars per share) $ (3.77) $ 1.02
Discounted Operations, Basic    
Discontinued operations earnings (loss) $ 42,230 $ (18,529)
Deduct preferred stock dividends 23 23
Undistributed earnings (loss) 42,207 (18,552)
Earnings (loss) attributable to participating preferred shareholders 166 (88)
Earnings (loss) attributable to common shareholders $ 42,041 $ (18,464)
Weighted average common shares outstanding (in shares) 9,652 9,769
Basic earnings (loss) from discontinued operations per common share (in dollars per share) $ 4.36 $ (1.89)
Discounted Operations, Diluted    
Earnings (loss) attributable to common shareholders $ 42,041 $ (18,464)
Add dividends on convertible preferred stock 20
Earnings (loss) attributable to common stock on a diluted basis $ 42,061 $ (18,464)
Weighted average common shares outstanding (in shares) 9,652 9,769
Additional shares to be issued related to the equity compensation plan (in shares) 3
Additional shares to be issued under full conversion of preferred stock (in shares) 67
Total shares for diluted (in shares) 9,722 9,769
Diluted earnings (loss) from discontinued operations per share (in dollars per share) $ 4.33 $ (1.89)