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Note 8 - Income Taxes (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Expense (Benefit), Total $ 1,182,918 $ (125,449)  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 4,900,000 2,300,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0   $ 0
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit), Total $ 100,000 $ 1,000,000