Note 11 - Fair Value Accounting and Measurement - Changes in Level 3 Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Balance at beginning of period			$ 3,887
Balance at end of period	$ 3,729		3,729		$ 3,887
Balance at Beginning of Period			12,563	$ 0	0
Transfers Into Level 3					12,490
Purchases					0
Unrealized					73
Total					12,563
Fair Value, Recurring [Member]
Balance at beginning of period			3,887
Balance at end of period	3,729		3,729		3,887
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Balance at beginning of period	3,825	$ 3,865	3,887	3,820	3,820
Servicing rights that result from transfers and sale of financial assets	71	45	145	143
Changes in fair value due to changes in model inputs or assumptions (1)	(167)	(38)	(303)	(91)
Balance at end of period	3,729	$ 3,872	3,729	3,872	3,887
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Balance at Beginning of Period	29,378		29,599	$ 0	0
Transfers Into Level 3	0		0		29,599
Purchases	0		0		0
Unrealized	(186)		(407)		0
Total	29,192		29,192		29,599
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Partnership Investments [Member]
Balance at Beginning of Period	12,733		12,563
Transfers Into Level 3	0		0
Purchases	(82)		(69)
Unrealized	136		293
Total	$ 12,787		$ 12,787		$ 12,563