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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Feb. 27, 2013
Oct. 18, 2004
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Sep. 23, 2010
Dec. 08, 2006
Oct. 21, 1999
Minimum [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     5 years            
Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years            
Maximum [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years            
Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     7 years            
The 2014 Plan [Member]                  
Common Stock, Capital Shares Reserved for Future Issuance     1,100,000            
Shares, Outstanding     186,370            
The 2006 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             800,000 400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     329,350            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 400,000                
The 1999 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     0            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   200,000              
Share-based Compensation Arrangements by Share-based Payment Award Exercise Price of Option Granted as Percentage of Bid Price of Underlying Shares     100.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     515,720 437,248 398,172 416,125      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 5,260,000 $ 3,546,000 $ 6,287,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 4,595,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     913,630