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Note 8 - Income Taxes (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Unrecognized Tax Benefits $ 100,000   $ 100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0   $ 0
Income Tax Expense (Benefit) 1,905,730 $ 1,551,693  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 6,343,968 $ 4,385,636