Note 12 - Share-based Compensation - Stock-settled Stock Appreciation Rights Transactions (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding SARS (in shares)	182,894
Outstanding SARS, weighted average exercise price (in dollars per share)	$ 18.99
Outstanding SARS, weighted average remaining life (Year)	2 years 14 days	2 years 222 days
Outstanding SARS, aggregate intrinsic value		$ 89
Granted SARs (in shares)	42,841
Granted SARS, weighted average exercise price (in dollars per share)	$ 17.77
Exercised SARs (in shares)
Exercised SARS, weighted average exercise price (in dollars per share)
Lapsed or cancelled (in shares)	(19,035)
Lapsed or cancelled, weighted average exercise price (in dollars per share)	$ 19.67
Outstanding SARS (in shares)	206,700	182,894
Outstanding SARS, weighted average exercise price (in dollars per share)	$ 18.67	$ 18.99
Exercisable (in shares)	168,478
Exercisable, weighted average exercise price (in dollars per share)	$ 18.88
Exercisable, weighted average remaining life (Year)	1 year 208 days
Exercisable, aggregate intrinsic value