Note 5 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income (loss)	$ 292	$ (1,245)	$ 43,110	$ (38,940)
Basic (in shares)	9,705	8,406	9,281	8,406
Stock options, restricted shares and warrants (in shares)		0		0
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed exercise of options and restricted shares (in shares)	9,705	8,406	9,281	8,406
Net income (loss) per common share - basic (in dollars per share)	$ 0.03	$ (0.15)	$ 4.64	$ (4.63)
Net income (loss) per common share - diluted (in dollars per share)	$ 0.03	$ (0.15)	$ 4.64	$ (4.63)