Note F - Common Stock and Warrants - Common Stock Activity (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Balance (in shares)			14,646,982
Common stock warrants exercised (in shares)			698	141,095
Common stock options exercised (in shares)	9,750	14,933	9,750	14,933
Balance (in shares)	14,657,430		14,657,430