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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss)	$ (26,675)	$ 6,377	$ (21,445)	$ 16,855
Weighted average shares outstanding - basic (in shares)	15,732,264	15,433,412	15,705,646	15,327,374
Dilutive common stock equivalents (in shares)	0	654,324	0	712,231
Weighted average number of shares outstanding during the period, diluted (in shares)	15,732,264	16,087,736	15,705,646	16,039,605
Basic (in dollars per share)	$ (1.70)	$ 0.41	$ (1.37)	$ 1.10
Diluted (in dollars per share)	$ (1.70)	$ 0.40	$ (1.37)	$ 1.05