Note 9 - Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income (loss)	$ (12,719)	$ 8,196	$ (34,164)	$ 25,051
Weighted average shares outstanding - basic (in shares)	15,806,852	15,528,534	15,739,381	15,394,427
Dilutive common stock equivalents (in shares)	0	571,316	0	665,259
Weighted average number of shares outstanding during the period, diluted (in shares)	15,806,852	16,099,850	15,739,381	16,059,686
Basic (in dollars per share)	$ (0.80)	$ 0.53	$ (2.17)	$ 1.63
Diluted (in dollars per share)	$ (0.80)	$ 0.51	$ (2.17)	$ 1.56