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Note I - Intangible Assets (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Amortization of Intangible Assets, Total $ 15,596 $ 13,726
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 13,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 13,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 13,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 13,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 13,000  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 131,000  
Research, Development, and Engineering Expense [Member]    
Amortization of Intangible Assets, Total $ 15,596 $ 13,726