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Note 7 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Unrecognized Tax Benefits $ 100,000   $ 100,000   $ 100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0   0   $ 0
Income Tax Expense (Benefit) 2,492,649 $ 1,834,400 6,476,012 $ 4,926,189  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 7,233,928 $ 4,993,857 $ 19,726,315 $ 13,204,584