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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Expense (Benefit) $ 1,823,367 $ 2,492,649 $ 2,780,908 $ 6,476,012
Accounting Standards Update 2016-09 [Member]        
Income Tax Expense (Benefit) $ (400,000)   $ (2,600,000)