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Note 13 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
Quarter Ended:
  
June 30, 2017
    
September 30, 2017
    
December 31, 2017
    
March 31, 2018
  
                                 
Sales
   $
79,657
     $
66,711
     $
60,110
     $
67,322
  
Gross Profit
   $
27,465
     $
23,479
     $
21,944
     $
24,919
  
Income from operations
   $
14,416
     $
12,248
     $
11,468
     $
14,004
  
Net income
   $
9,276
     $
8,760
     $
9,064
     $
10,183
  
Diluted net income per common share
   $
0.45
     $
0.43
     $
0.44
     $
0.50
  
Quarter Ended:
  
June 30, 2016
    
September 30, 2016
    
December 31, 2016
    
March 31, 2017
  
                                 
Sales
   $
72,487
     $
60,791
     $
52,866
     $
63,032
  
Gross Profit
   $
22,452
     $
18,064
     $
16,643
     $
22,155
  
Income from operations
   $
10,400
     $
7,731
     $
7,655
     $
11,697
  
Net income
   $
6,594
     $
4,899
     $
4,823
     $
7,503
  
Diluted net income per common share
   $
0.32
     $
0.24
     $
0.24
     $
0.37