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Note 16 - Employee and Non-employee Stock Options (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
           
Weighted
    
Weighted
          
           
Average
    
Average
    
Aggregate
  
           
Exercise Price
    
Remaining
    
Intrinsic
  
   
Shares
    
Per Share
    
Life (Years)
    
Value
  
                                 
Outstanding at March 31, 2016
    
40,000
     $
8.74
      
2.09
     $
617,000
  
Granted
    
-
      
-
      
 
      
 
  
Exercised
    
-
      
-
      
 
      
 
  
Forfeited
    
(30,000
 )    
-
      
 
      
 
  
Repurchased
    
-
      
-
      
 
      
 
  
Outstanding at March 31, 2017
    
10,000
      
10.08
      
6.15
      
101,000
  
Granted
    
-
      
-
      
 
      
 
  
Exercised
    
(818
 )    
10.56
      
 
      
 
  
Forfeited
    
-
      
-
      
 
      
 
  
Repurchased
    
-
      
-
      
 
      
 
  
Outstanding at March 31, 2018
    
9,182
     $
10.03
      
5.13
     $
140,193
  
Exercisable at March 31, 2018
    
9,182
     $
10.03
      
5.13
     $
140,193