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Note 8 - Intangible Assets (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 12, 2016
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Development of Acquired Technology, Annual Compensation for Specialist $ 200,000      
Impairment of Real Estate     $ 0 $ 567,133
Finite-Lived Intangible Asset, Useful Life     16 years  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     $ 424,813  
Finite-Lived Intangible Assets, Amortization Expense, after Year Fourteen     $ 283,201  
Patented Technology [Member]        
Stock Issued During Period, Value, Purchase of Assets 5      
Noncash or Part Noncash Acquisition, Noncash Consideration, Carrying Value of Properties to be Transferred 2,161,467      
Noncash or Part Noncash Acquisition, Noncash Consideration, Original Cost of Property Transferred $ 202,666      
Patented Technology [Member] | Subsequent Event [Member]        
Stock Issued During Period, Value, Purchase of Assets   $ 1,000,000