Note 4 - Stock-Based Compensation - Schedule of Unvested Performance Stock Unit (Details) - Performance Shares [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Balance (in shares)	0	124		0
Balance, weighted average grant date fair value (in dollars per share)	$ 0	$ 11.08		$ 0
Granted (in shares)	73	0		124
Granted, weighted average grant date fair value (in dollars per share)	$ 31.93	$ 0		$ 11.08
Vested (in shares)	0	(82)	[1]	0
Vested, weighted average grant date fair value (in dollars per share)	$ 0	$ 15.54	[1]	$ 0
Forfeited (in shares)	(6)	(42)	[1]	0
Forfeited, weighted average grant date fair value (in dollars per share)	$ 32.02	$ 11.08	[1]	$ 0
Forfeited, weighted average grant date fair value (in dollars per share)	$ (32.02)	$ (11.08)	[1]	$ 0
Balance (in shares)	67	0		124
Balance, weighted average grant date fair value (in dollars per share)	$ 31.92	$ 0		$ 11.08

[1] Includes the impact of the modification of 21 PRSUs which were cancelled and reissued at a grant date fair value of $28.93.