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Note L - Stock Option Plans (Details Textual) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Jul. 07, 2017
Jul. 31, 2017
Jun. 30, 2011
Jul. 31, 2004
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
Apr. 30, 2016
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price           $ 1.73 $ 1.70    
Income from Non-employee Options           $ 9,384      
Share-based Goods and Nonemployee Services Transaction, Capitalized Cost             $ 25,346    
Gian Domenico Trombetta [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   400,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period         400,000        
Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           1,006,741 520,337    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount           $ 636,058 $ 579,103    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 603,979 $ 603,979 $ 678,842    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           2 years 222 days 3 years 14 days    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price           $ 1.82 $ 1.79    
Employee Stock Options Issued at $2.55 Per Share [Member] | Gian Domenico Trombetta [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 250,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 2.55                
Employee Stock Options Issued at the Higher of $2.55 Per Share or Market Price [Member] | Gian Domenico Trombetta [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 150,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 2.55                
Stock Option Plan 2004 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       750,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Period from Grant Date       3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expire Period after Grant Date       5 years          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         0 0      
Stock Option Plan 2011 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               4,000,000 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Period from Grant Date     3 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expire Period after Grant Date     5 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     2,000,000