Note 8 - Fair Value Measurements - Changes in Fair Value Due to Observable Factors (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair value, other assets	$ 2,007	$ 2,024	$ 1,965	$ 2,034
Fair value, other liabilities	0	0	0	0
Total realized gains included in income, other assets	40	2	82	(8)
Total realized gains included in income, other liabilities	0	0	0	0
Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held, other assets	0	0	0	0
Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held, other liabilities	0	0	0	0
Purchases, issuances and settlements, net, other assets	0	0	0	0
Purchases, issuances and settlements, net, other liabilities	0	0	0	0
Transfers out of Level 3, other assets	0	0	0	0
Transfers out of Level 3, other liabilities	0	0	0	0
Fair value, other assets	2,047	2,026	2,047	2,026
Fair value, other liabilities	0	0	0	0
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at June 30	40	2	82	(8)
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at June 30	$ 0	$ 0	$ 0	$ 0