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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Capitalized Contract Cost, Net, Total $ 1,378,336 $ 1,400,000 $ 1,403,608 [1]
Retained Earnings (Accumulated Deficit), Ending Balance 47,418,839   42,675,805 [2]
Deferred Tax Liabilities, Net, Noncurrent 20,116,385   $ 19,833,678 [2]
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Capitalized Contract Cost, Net, Total (1,378,336)    
Retained Earnings (Accumulated Deficit), Ending Balance (1,031,436) (1,100,000)  
Deferred Tax Liabilities, Net, Noncurrent $ (346,900) $ (300,000)  
[1] The beginning balance consists entirely of a cumulative adjustment recorded on January 1st, 2018 as a result of the modified retrospective adoption of ASU 2014-09. See note 3 for additional information.
[2] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.