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Note 17 - Employee and Non-employee Stock Options (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
           
Weighted
    
Weighted
          
           
Average
    
Average
    
Aggregate
  
           
Exercise Price
    
Remaining
    
Intrinsic
  
   
Shares
    
Per Share
    
Life (Years)
    
Value
  
                                 
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
  
Granted
    
-
      
-
      
 
      
 
  
Exercised
    
(1,682
 )    
10.56
      
 
      
 
  
Forfeited
    
-
      
-
      
 
      
 
  
Repurchased
    
-
      
-
      
 
      
 
  
Outstanding at March 31, 2019
    
7,500
     $
9.91
      
4.07
     $
152,075
  
Exercisable at March 31, 2019
    
7,500
     $
9.91
      
4.07
     $
152,075