Note 7 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Lapsed or cancelled (in shares)		(133,173)
Lapsed or cancelled, weighted average exercise price (in dollars per share)		$ 18.52
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 4 months 28 days	2 years 2 months 23 days
Outstanding SARS, aggregate intrinsic value		$ 43	$ 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)		(37,860)
Lapsed or cancelled, weighted average exercise price (in dollars per share)		$ 23.62
Outstanding SARS (in shares)		333,734	320,385
Outstanding SARS, weighted average exercise price (in dollars per share)		$ 13.79	$ 15.23
Exercisable (in shares)		225,471
Exercisable, weighted average exercise price (in dollars per share)		$ 13.47
Exercisable SARS, weighted average remaining life (Year)		1 year 6 months 14 days
Exercisable, aggregate intrinsic value		$ 43

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