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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Years ended March 31,
  
2020
    
2019
  
Continuing Operations
 
(In thousands, except per share amounts)
  
Basic
                
Continuing operations earnings (loss)
   $
51,188
     $
(36,483
 )
Deduct preferred stock dividends
    
23
      
23
  
Undistributed earnings (loss)
    
51,165
      
(36,506
 )
Earnings (loss) attributable to participating preferred shareholders
    
206
      
(143
 )
Earnings (loss) attributable to common shareholders
   $
50,959
     $
(36,363
 )
Weighted average common shares outstanding
    
9,264
      
9,652
  
Basic earnings (loss) from continuing operations per common share
   $
5.50
     $
(3.77
 )
Diluted
                
Earnings (loss) attributable to common shareholders
   $
50,959
     $
(36,363
 )
Add dividends on convertible preferred stock
    
20
      
-
  
Earnings (loss) attributable to common stock on a diluted basis
   $
50,979
     $
(36,363
 )
Weighted average common shares outstanding-basic
    
9,264
      
9,652
  
Additional shares to be issued related to the equity compensation plan
    
2
      
-
  
Additional shares to be issued under full conversion of preferred stock
    
67
      
-
  
Total shares for diluted
    
9,333
      
9,652
  
Diluted earnings (loss) from continuing operations per share
   $
5.46
     $
(3.77
 )
Years ended March 31,
  
2020
    
2019
  
Discontinued Operations
 
(In thousands, except per share amounts)
  
Basic
                
Discontinued operations earnings
   $
1,147
     $
42,230
  
Deduct preferred stock dividends
    
23
      
23
  
Undistributed earnings
    
1,124
      
42,207
  
Earnings attributable to participating preferred shareholders
    
5
      
166
  
Earnings attributable to common shareholders
   $
1,119
     $
42,041
  
Weighted average common shares outstanding
    
9,264
      
9,652
  
Basic earnings from discontinued operations per common share
   $
0.12
     $
4.36
  
Diluted
                
Earnings attributable to common shareholders
   $
1,119
     $
42,041
  
Add dividends on convertible preferred stock
    
20
      
20
  
Earnings attributable to common stock on a diluted basis
   $
1,139
     $
42,061
  
Weighted average common shares outstanding-basic
    
9,264
      
9,652
  
Additional shares to be issued related to the equity compensation plan
    
2
      
3
  
Additional shares to be issued under full conversion of preferred stock
    
67
      
67
  
Total shares for diluted
    
9,333
      
9,722
  
Diluted earnings from discontinued operations per share
   $
0.12
     $
4.33