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Note 8 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Expense (Benefit), Total $ 1,228,000 $ 1,083,000 $ 2,411,000 $ 958,000  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 4,800,000 6,300,000 9,800,000 8,600,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0   0   $ 0
Accounting Standards Update 2016-09 [Member]          
Income Tax Expense (Benefit), Total $ 200,000 $ 1,200,000 $ 300,000 $ 2,200,000