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Note 15 - Employee and Non-employee Stock Options - Summary of Stock Option Activity (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Outstanding, shares (in shares) 40,000 46,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 8.74 $ 8.68  
Outstanding, weighted average remaining life (Year) 6 years 54 days 2 years 32 days 2 years 317 days
Outstanding, aggregate intrinsic value $ 101,000 $ 617,000 $ 732,000
Granted, shares (in shares) 0 0  
Granted, weighted average exercise price per share (in dollars per share) $ 0 $ 0  
Exercised, shares (in shares) 0 0  
Exercised, weighted average exercise price per share (in dollars per share) $ 0 $ 0  
Forfeited, shares (in shares) (30,000) (6,000)  
Forfeited, weighted average exercise price per share (in dollars per share) $ 8.29 $ 8.29  
Repurchased, shares (in shares) 0 0  
Repurchased, weighted average exercise price per share (in dollars per share) $ 0 $ 0  
Outstanding, shares (in shares) 10,000 40,000 46,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 10.08 $ 8.74 $ 8.68
Exercisable, shares (in shares) 10,000    
Exercisable, weighted average exercise price per share (in dollars per share) $ 10.08    
Exercisable, weighted average remaining life (Year) 6 years 54 days    
Exercisable, aggregate intrinsic value $ 101,000