Note 5 - Stock-Based Compensation - Schedule of Unvested Restricted Stock Activity (Details) - Restricted Stock [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2023 $ / shares shares
Balance (in shares) | shares	196
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 32.06
Granted (in shares) | shares	0
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 0
Vested (in shares) | shares	(46)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 33.29
Forfeited (in shares) | shares	0
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 44.36
Balance (in shares) | shares	150
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 31.66