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Note O - Stock Options - Options Outstanding and Exercisable (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Range of exercise prices, lower range (in dollars per share) $ 1.90
Range of exercise prices, upper range (in dollars per share) $ 5.04
Options outstanding (in shares) | shares 1,477,493
Options exercisable (in shares) | shares 261,294
Options exercisable, weighted average exercise price (in dollars per share) $ 3.96
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) $ 2.50
Options outstanding (in shares) | shares 87,064
Options outstanding, weighted average exercise price (in dollars per share) $ 2.16
Options outstanding, weighted average remaining remaining life (Year) 4 years 237 days
Options exercisable (in shares) | shares 56,422
Options exercisable, weighted average exercise price (in dollars per share) $ 2.16
Exercise Price Range 2 [Member]  
Range of exercise prices, lower range (in dollars per share) 2.51
Range of exercise prices, upper range (in dollars per share) $ 3.50
Options outstanding (in shares) | shares 1,207,296
Options outstanding, weighted average exercise price (in dollars per share) $ 2.70
Options outstanding, weighted average remaining remaining life (Year) 6 years 54 days
Options exercisable (in shares) | shares 21,740
Options exercisable, weighted average exercise price (in dollars per share) $ 3.23
Exercise Price Range 3 [Member]  
Range of exercise prices, lower range (in dollars per share) 3.51
Range of exercise prices, upper range (in dollars per share) $ 5.04
Options outstanding (in shares) | shares 183,132
Options outstanding, weighted average exercise price (in dollars per share) $ 4.60
Options outstanding, weighted average remaining remaining life (Year) 2 years 281 days
Options exercisable (in shares) | shares 183,132
Options exercisable, weighted average exercise price (in dollars per share) $ 4.60