Note 7 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Lapsed or cancelled (in shares)		(92,457)
Lapsed or cancelled, weighted average exercise price (in dollars per share)		$ 20.77
Stock Appreciation Rights (SARs) [Member]
Outstanding SARS (in shares)		320,385
Outstanding (in dollars per share)		$ 15.23
Outstanding SARS, weighted average remaining life (Year)		2 years 7 months 28 days	2 years 2 months 23 days
Outstanding SARS, aggregate intrinsic value		$ 4	$ 69
Granted SARs (in shares)	[1]	51,209
Granted SARS, weighted average exercise price (in dollars per share)		$ 12.04
Exercised SARs (in shares)		0
Exercised SARS, weighted average exercise price (in dollars per share)		$ 0
Lapsed or cancelled (in shares)		(37,243)
Lapsed or cancelled, weighted average exercise price (in dollars per share)		$ 23.59
Outstanding SARS (in shares)		334,351	320,385
Outstanding SARS, weighted average exercise price (in dollars per share)		$ 13.81	$ 15.23
Exercisable (in shares)		226,088
Exercisable, weighted average exercise price (in dollars per share)		$ 13.51
Exercisable SARS, weighted average remaining life (Year)		1 year 9 months 14 days
Exercisable, aggregate intrinsic value		$ 4

[1] The weighted average grant date fair value of SARs granted was $4.58 per share.