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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Expense (Benefit) $ 1,082,990 $ 2,077,633 $ 957,541 $ 3,983,363
Accounting Standards Update 2016-09 [Member]        
Income Tax Expense (Benefit) $ (1,200,000)   $ (2,200,000)