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Note 17 - Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Quarterly Financial Information [Table Text Block]
2020
  
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
  
Revenues
   $
26,288
     $
25,536
     $
31,655
     $
34,208
  
Gross profit
    
16,139
      
15,476
      
14,677
      
18,641
  
Net income (loss)
    
4,597
      
3,062
      
(4,630
 )    
(1,680
 )
Basic earnings (loss) per share
   $
1.18
     $
0.74
     $
(1.06
 )   $
(0.38
 )
Diluted earnings (loss) per share
    
1.13
      
0.71
      
(1.06
 )    
(0.37
 )
2019
  
First Quarter
    
Second Quarter
    
Third Quarter
    
Fourth Quarter
  
Revenues
   $
25,142
     $
24,865
     $
26,682
     $
26,446
  
Gross profit
    
15,091
      
14,577
      
15,634
      
15,614
  
Net income
    
4,230
      
994
      
858
      
1,402
  
Basic earnings per share
   $
1.11
     $
0.26
     $
0.22
     $
0.36
  
Diluted earnings per share
    
1.06
      
0.25
      
0.21
      
0.34