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Note 7 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit) $ 2,860,000 $ 2,998,000 $ 12,204,000 $ 9,772,000
Effective Income Tax Rate Reconciliation, Percent 24.00% 38.30% 31.10% 37.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     31.50%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     $ 1,700,000  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ (384,000)  
Tax Adjustments, Settlements, and Unusual Provisions $ 175,000