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Note P - Stock Options - Options Outstanding and Exercisable (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Range of exercise prices, lower range (in dollars per share) $ 1.90
Range of exercise prices, upper range (in dollars per share) $ 11.04
Options outstanding (in shares) | shares 341,663
Options exercisable (in shares) | shares 216,566
Options exercisable, weighted average exercise price (in dollars per share) $ 4.56
Exercise Price Range 1 [Member]  
Range of exercise prices, lower range (in dollars per share) 1.90
Range of exercise prices, upper range (in dollars per share) $ 3
Options outstanding (in shares) | shares 122,485
Options outstanding, weighted average exercise price (in dollars per share) $ 2.24
Options outstanding, weighted average remaining remaining life (Year) 5 years 295 days
Options exercisable (in shares) | shares 34,815
Options exercisable, weighted average exercise price (in dollars per share) $ 2.15
Exercise Price Range 2 [Member]  
Range of exercise prices, lower range (in dollars per share) 3.01
Range of exercise prices, upper range (in dollars per share) $ 5
Options outstanding (in shares) | shares 197,927
Options outstanding, weighted average exercise price (in dollars per share) $ 4.47
Options outstanding, weighted average remaining remaining life (Year) 3 years 240 days
Options exercisable (in shares) | shares 160,500
Options exercisable, weighted average exercise price (in dollars per share) $ 4.41
Exercise Price Range 3 [Member]  
Range of exercise prices, lower range (in dollars per share) 5.01
Range of exercise prices, upper range (in dollars per share) $ 11.04
Options outstanding (in shares) | shares 21,251
Options outstanding, weighted average exercise price (in dollars per share) $ 9.67
Options outstanding, weighted average remaining remaining life (Year) 262 days
Options exercisable (in shares) | shares 21,251
Options exercisable, weighted average exercise price (in dollars per share) $ 9.67