Annual report pursuant to Section 13 and 15(d)

Note L - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details)

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Note L - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of options (in shares)   224,999  
Weighted average exercise price, outstanding (in dollars per share)   $ 2.53  
Weighted average remaining contractual life, outstanding (Year) 2 years 146 days   5 years 116 days
Weighted average exercise price, granted (in dollars per share) $ 0 $ 1.73  
Number of options exercisable (in shares) 1,317,632    
Weighted average exercise price, exercisable (in dollars per share) $ 1.79    
Weighted average remaining contractual life, exercisable (Year) 2 years 54 days    
Number of options (in shares) 1,670,221   224,999
Weighted average exercise price, outstanding (in dollars per share) $ 1.71   $ 2.53
Employee Stock Option [Member]      
Number of options (in shares) 1,985,335 1,511,995  
Weighted average exercise price, outstanding (in dollars per share) $ 1.74 $ 1.74  
Weighted average remaining contractual life, outstanding (Year)   3 years 14 days 2 years 354 days
Aggregate intrinsic value, outstanding   $ 25,160 $ 102,605
Number of options granted (in shares)   1,806,741  
Weighted average exercise price, granted (in dollars per share)   $ 1.82  
Weighted average remaining contractual life, granted (Year)   4 years 251 days  
Aggregate intrinsic value, granted   $ 25,610  
Number of options exercised (in shares)   (83,333)  
Weighted average exercise price, exercised (in dollars per share)   $ 0.75  
Number of options forfeited and expired (in shares) (315,114) (1,250,068)  
Number of options exercisable (in shares)   1,317,441  
Weighted average exercise price, exercisable (in dollars per share)   $ 1.84  
Weighted average remaining contractual life, exercisable (Year)   2 years 167 days  
Aggregate intrinsic value, exercisable   $ 8,537  
Forfeited or expired (in dollars per share) $ 1.50    
Number of options (in shares)   1,985,335 1,511,995
Weighted average exercise price, outstanding (in dollars per share)   $ 1.74 $ 1.74
Non-employee Options [Member]      
Number of options (in shares) 224,999    
Weighted average exercise price, outstanding (in dollars per share) $ 2.53    
Weighted average remaining contractual life, outstanding (Year) 2 years 343 days 4 years 116 days  
Number of options granted (in shares)   8,333  
Weighted average exercise price, granted (in dollars per share)   $ 0.75  
Weighted average remaining contractual life, granted (Year)   4 years 120 days  
Number of options forfeited and expired (in shares) (200,000)    
Number of options exercisable (in shares) 27,777 23,067  
Weighted average exercise price, exercisable (in dollars per share) $ 2.10 $ 2.22  
Weighted average remaining contractual life, exercisable (Year) 2 years 240 days 4 years 138 days  
Forfeited or expired (in dollars per share) $ 2.55    
Number of options (in shares) 33,332 224,999  
Weighted average exercise price, outstanding (in dollars per share) $ 1.87 $ 2.53