Note Q - Stockholders' Equity - Stock Sold in Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						12 Months Ended			22 Months Ended
	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2022	Jul. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Net Proceeds							$ 1,238	$ 15,397	$ 39,203
Raymond James & Associates, Inc. [Member] | Second ATM Offering [Member]
Weighted Average Per Share Price (in dollars per share)	$ 2.7830	$ 2.8947	$ 2.9045	$ 9.1061	$ 9.1115	$ 9.0622
Number of Shares Sold (in shares)	29,426	313,333	94,491	6,740	34,686	65,748				544,424
Net Proceeds	$ 80	$ 889	$ 269	$ 60	$ 310	$ 584				$ 2,192
Compensation to Distribution Agent	$ 2	$ 18	$ 5	$ 1	$ 6	$ 12				$ 44