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Note P - Options Outstanding and Exercisable (Details)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Exercise Price Range 1 [Member]  
Range of exercise prices, lower range (in dollars per share) $ 0.15
Range of exercise prices, upper range (in dollars per share) $ 0.40
Options outstanding (in shares) | shares 2,893,000
Options outstanding, weighted average exercise price (in dollars per share) $ 0.24
Options outstanding, weighted average remaining life 4 years 248 days
Options exercisable (in shares) | shares 1,244,167
Options exercisable, weighted average exercise price (in dollars per share) $ 0.28
Exercise Price Range 2 [Member]  
Range of exercise prices, lower range (in dollars per share) 0.41
Range of exercise prices, upper range (in dollars per share) $ 0.79
Options outstanding (in shares) | shares 1,280,833
Options outstanding, weighted average exercise price (in dollars per share) $ 0.41
Options outstanding, weighted average remaining life 5 years 65 days
Options exercisable (in shares) | shares 482,486
Options exercisable, weighted average exercise price (in dollars per share) $ 0.41
Exercise Price Range 3 [Member]  
Range of exercise prices, lower range (in dollars per share) 0.80
Range of exercise prices, upper range (in dollars per share) $ 0.92
Options outstanding (in shares) | shares 205,000
Options outstanding, weighted average exercise price (in dollars per share) $ 0.90
Options outstanding, weighted average remaining life 1 year 7 days
Options exercisable (in shares) | shares 205,000
Options exercisable, weighted average exercise price (in dollars per share) $ 0.90
Exercise Price Range 4 [Member]  
Range of exercise prices, lower range (in dollars per share) 0.15
Range of exercise prices, upper range (in dollars per share) $ 0.92
Options outstanding (in shares) | shares 4,378,833
Options exercisable (in shares) | shares 1,931,653
Options exercisable, weighted average exercise price (in dollars per share) $ 0.38