Note J - Earnings Per Share - Reconciliations of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 4,404	$ 10,569	$ (1,758)	$ (1,621)	$ (6,235)	$ 5,118	$ 13,215	$ (2,738)
Less: Preferred Stock dividends	125			125			372	372
Less: Earnings attributable to participating securities	543			0			1,661	0
Income (loss) attributable to common stockholders	3,736			(1,746)			11,182	(3,110)
Add back: Allocation of earnings to participating securities	543			0			1,661	0
Less: Re-allocation of earnings to participating securities considering potentially dilutive securities	(525)			0			(1,578)	0
Numerator for diluted EPS	$ 3,754			$ (1,746)			$ 11,265	$ (3,110)
Basic (in shares)	6,889			6,523			6,743	6,432
Diluted (in shares)	7,162			6,523			7,153	6,432
Basic (in dollars per share)	$ 0.54			$ (0.27)			$ 1.66	$ (0.48)
Diluted (in dollars per share)	$ 0.52			$ (0.27)			$ 1.57	$ (0.48)