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Note 8 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Expense (Benefit), Total $ 2,469,000 $ 3,134,000 $ 4,111,000 $ 7,005,000
Effective Income Tax Rate Reconciliation, Percent, Total 27.00% 22.60% 25.50% 23.10%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount     $ 322,000 $ (134,000)