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Note J - Patents (Details Textual) - USD ($)
 12 Months Ended
Jul. 13, 2017
Dec. 31, 2017
Dec. 31, 2016
Amortization of Intangible Assets   $ 510,676 $ 70,699
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   945,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two   932,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three   486,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four   39,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five   38,000  
Stock Issued During Period, Value, Purchase of Assets   2,486,000  
APAD Octrooi B.V. and APAD B.V. [Member]      
Stock Issued During Period, Shares, Purchase of Assets 1,646,358    
Stock Issued During Period, Value, Purchase of Assets $ 2,486,000    
Asset Purchase Agreement, Post-closing Adjustments, Percentage of Initial Shares, Maximum 25.00%    
Asset Purchase Agreement, Post-closing Adjustments, Amount of Initial Shares, Maximum $ 250,000    
Asset Purchase Agreement, Post-closing Adjustments, Liabilities   275,000  
Asset Purchase Agreement, Payments of Legal Fees $ 153,000    
Patents [Member]      
Finite-Lived Intangible Asset, Useful Life 3 years    
Amortization of Intangible Assets   $ 510,676 $ 70,699
Finite-lived Intangible Assets Acquired $ 2,639,000    
Patents [Member] | Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life   3 years  
Patents [Member] | Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life   20 years  
Patents [Member] | Weighted Average [Member]      
Finite-Lived Intangible Asset, Useful Life   5 years