Note G - Stock-based Compensation - Summarizes All Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Options outstanding (in shares)	37,615	87,747
Options outstanding, weighted average exercise price (in dollars per share)	$ 80.21	$ 40.25
Adjustment and Correction (in shares)	20,000	0
Adjustment and Correction, weighted average exercise price (in dollars per share)		$ 0
Granted (in shares)	0	0
Granted, weighted average exercise price (in dollars per share)	$ 0	$ 0
Exercised (in shares)	0	(31,906)
Exercised, weighted average exercise price (in dollars per share)		$ 2.95
Exercised, aggregate intrinsic value	$ 0	$ 0
Unvested options forfeited (in shares)	0	(7,411)
Unvested options forfeited, weighted average exercise price (in dollars per share)		$ 7.40
Vested options expired (in shares)	(4,947)	(10,815)
Vested options expired, weighted average exercise price (in dollars per share)	$ 95.80	$ 37.87
Adjustment and Correction (in shares)	(20,000)	(0)
Options outstanding (in shares)	12,668	37,615
Options outstanding, weighted average exercise price (in dollars per share)	$ 78.88	$ 80.21
Options outstanding, weighted average remaining contractual term (Year)	1 year 1 month 28 days
Options outstanding, aggregate intrinsic value	$ 0
Vested and expected to vest (in shares)	12,668
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 78.88
Vested and expected to vest, weighted average remaining contractual term (Year)	1 year 1 month 28 days
Vested and expected to vest, aggregate intrinsic value	$ 0
Exercisable at December 31, 2022 (in shares)	12,668
Exercisable, weighted average exercise price (in dollars per share)	$ 78.88
Exercisable, weighted average remaining contractual term (Year)	1 year 1 month 28 days
Exercisable, aggregate intrinsic value	$ 0