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Note 7 - Long-term Debt (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
   
March 31,
201
8
   
March 31,
201
7
 
Line of credit (3.75% at March 31, 2018)
  $
28,000
    $
35,500
 
Term loan (3.69% at March 31, 2018)
   
18,625
     
19,750
 
Less: discount
   
(365
)    
(450
)
Less: current portion
   
(1,625
)    
(1,125
)
Long-term portion
  $
44,635
    $
53,675
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Year ending March 31,
       
2019
  $
1,625,000
 
2020
   
2,125,000
 
2021
   
2,625,000
 
2022
   
40,250,000
 
    $
46,625,000