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Note 10 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 33.40% 35.00%   33.20% 35.70%
Income Tax Expense (Benefit) $ 1,329,000 $ 1,473,000   $ 2,392,000 $ 2,113,000
Tax Adjustments, Settlements, and Unusual Provisions     $ 40,000    
Accounting Standards Update 2016-09 [Member]          
Income Tax Expense (Benefit) $ (63,000)     $ (132,000)