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Note 10 - Income Taxes (Details Textual)
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Minimum [Member] | Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, Percent     34.00%  
Maximum [Member] | Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, Percent     37.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%   35.00%  
Effective Income Tax Rate Reconciliation, Percent 31.60% 35.30% 34.30% 35.30%