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Note 15 - Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
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
  
2018
  
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
  
Revenues
   $
22,673
     $
22,954
     $
23,671
     $
26,881
  
Gross profit
    
12,671
      
13,233
      
12,681
      
16,034
  
Net income (loss)
    
1,517
      
2,353
      
(11,086
 )    
4,254
  
Basic earnings (loss) per share
   $
0.41
     $
0.63
     $
(2.93
 )   $
1.12
  
Diluted earnings (loss) per share
    
0.39
      
0.60
      
(2.93
 )    
1.08