Note 7 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Term Loans by Year of Origination (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Year One	$ 93,329
Financing Receivable, Year Two	345,962
Financing Receivable, Year Three	296,441
Financing Receivable, Year Four	246,398
Financing Receivable, Year Five	65,456
Financing Receivable, Prior	75,838
Financing Receivable, Revolving	116,890
Financing Receivable, Total	1,240,314
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	74
Current-period gross writeoffs, Year Three	90
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	4
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	168	$ 13
Pass [Member]
Financing Receivable, Year One	76,023
Financing Receivable, Year Two	324,490
Financing Receivable, Year Three	247,024
Financing Receivable, Year Four	208,711
Financing Receivable, Year Five	55,840
Financing Receivable, Prior	71,736
Financing Receivable, Revolving	107,823
Financing Receivable, Total	1,091,647
Watch [Member]
Financing Receivable, Year One	7,974
Financing Receivable, Year Two	7,926
Financing Receivable, Year Three	46,706
Financing Receivable, Year Four	30,361
Financing Receivable, Year Five	7,286
Financing Receivable, Prior	3,505
Financing Receivable, Revolving	7,861
Financing Receivable, Total	111,619
Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	111
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	111
Substandard [Member]
Financing Receivable, Year One	31
Financing Receivable, Year Two	13,350
Financing Receivable, Year Three	1,644
Financing Receivable, Year Four	7,180
Financing Receivable, Year Five	2,330
Financing Receivable, Prior	458
Financing Receivable, Revolving	1,188
Financing Receivable, Total	26,181
Substandard Impaired [Member]
Financing Receivable, Year One	9,301
Financing Receivable, Year Two	196
Financing Receivable, Year Three	1,067
Financing Receivable, Year Four	35
Financing Receivable, Year Five	0
Financing Receivable, Prior	139
Financing Receivable, Revolving	18
Financing Receivable, Total	10,756
Construction Real Estate [Member]
Financing Receivable, Year One	5,719
Financing Receivable, Year Two	45,660
Financing Receivable, Year Three	1,605
Financing Receivable, Year Four	1,045
Financing Receivable, Year Five	0
Financing Receivable, Prior	454
Financing Receivable, Revolving	5,273
Financing Receivable, Total	59,756
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	(0)	(0)
Construction Real Estate [Member] \| Pass [Member]
Financing Receivable, Year One	5,719
Financing Receivable, Year Two	45,660
Financing Receivable, Year Three	1,605
Financing Receivable, Year Four	823
Financing Receivable, Year Five	0
Financing Receivable, Prior	373
Financing Receivable, Revolving	5,273
Financing Receivable, Total	59,453
Construction Real Estate [Member] \| Watch [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	222
Financing Receivable, Year Five	0
Financing Receivable, Prior	81
Financing Receivable, Revolving	0
Financing Receivable, Total	303
Construction Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Construction Real Estate [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Construction Real Estate [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Commercial Portfolio Segment [Member]
Financing Receivable, Year One	14,842
Financing Receivable, Year Two	16,308
Financing Receivable, Year Three	14,304
Financing Receivable, Year Four	4,927
Financing Receivable, Year Five	3,678
Financing Receivable, Prior	2,136
Financing Receivable, Revolving	26,150
Financing Receivable, Total	82,345
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	4
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	4	(0)
Commercial Portfolio Segment [Member] \| Pass [Member]
Financing Receivable, Year One	14,768
Financing Receivable, Year Two	15,628
Financing Receivable, Year Three	13,152
Financing Receivable, Year Four	3,775
Financing Receivable, Year Five	3,557
Financing Receivable, Prior	1,881
Financing Receivable, Revolving	22,255
Financing Receivable, Total	75,016
Commercial Portfolio Segment [Member] \| Watch [Member]
Financing Receivable, Year One	23
Financing Receivable, Year Two	552
Financing Receivable, Year Three	1,149
Financing Receivable, Year Four	570
Financing Receivable, Year Five	121
Financing Receivable, Prior	178
Financing Receivable, Revolving	2,707
Financing Receivable, Total	5,300
Commercial Portfolio Segment [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	111
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	111
Commercial Portfolio Segment [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	71
Financing Receivable, Year Three	0
Financing Receivable, Year Four	471
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	1,188
Financing Receivable, Total	1,730
Commercial Portfolio Segment [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	51
Financing Receivable, Year Two	57
Financing Receivable, Year Three	3
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	77
Financing Receivable, Revolving	0
Financing Receivable, Total	188
Family Residential Real Estate 1-4 [Member]
Financing Receivable, Year One	10,532
Financing Receivable, Year Two	89,258
Financing Receivable, Year Three	79,327
Financing Receivable, Year Four	56,812
Financing Receivable, Year Five	10,255
Financing Receivable, Prior	22,668
Financing Receivable, Revolving	17,566
Financing Receivable, Total	286,418
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	(0)	4
Family Residential Real Estate 1-4 [Member] \| Pass [Member]
Financing Receivable, Year One	10,438
Financing Receivable, Year Two	88,375
Financing Receivable, Year Three	66,711
Financing Receivable, Year Four	55,200
Financing Receivable, Year Five	9,996
Financing Receivable, Prior	21,924
Financing Receivable, Revolving	17,476
Financing Receivable, Total	270,120
Family Residential Real Estate 1-4 [Member] \| Watch [Member]
Financing Receivable, Year One	94
Financing Receivable, Year Two	746
Financing Receivable, Year Three	11,044
Financing Receivable, Year Four	1,593
Financing Receivable, Year Five	0
Financing Receivable, Prior	620
Financing Receivable, Revolving	72
Financing Receivable, Total	14,169
Family Residential Real Estate 1-4 [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Family Residential Real Estate 1-4 [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	19
Financing Receivable, Year Three	971
Financing Receivable, Year Four	0
Financing Receivable, Year Five	259
Financing Receivable, Prior	62
Financing Receivable, Revolving	0
Financing Receivable, Total	1,311
Family Residential Real Estate 1-4 [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	118
Financing Receivable, Year Three	601
Financing Receivable, Year Four	19
Financing Receivable, Year Five	0
Financing Receivable, Prior	62
Financing Receivable, Revolving	18
Financing Receivable, Total	818
Agriculture [Member]
Financing Receivable, Year One	10,788
Financing Receivable, Year Two	13,571
Financing Receivable, Year Three	7,444
Financing Receivable, Year Four	3,833
Financing Receivable, Year Five	679
Financing Receivable, Prior	1,044
Financing Receivable, Revolving	55,043
Financing Receivable, Total	92,402
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	74
Current-period gross writeoffs, Year Three	90
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	164	(0)
Agriculture [Member] \| Pass [Member]
Financing Receivable, Year One	8,790
Financing Receivable, Year Two	12,970
Financing Receivable, Year Three	6,844
Financing Receivable, Year Four	3,750
Financing Receivable, Year Five	597
Financing Receivable, Prior	1,028
Financing Receivable, Revolving	52,403
Financing Receivable, Total	86,382
Agriculture [Member] \| Watch [Member]
Financing Receivable, Year One	1,881
Financing Receivable, Year Two	580
Financing Receivable, Year Three	16
Financing Receivable, Year Four	30
Financing Receivable, Year Five	82
Financing Receivable, Prior	16
Financing Receivable, Revolving	2,640
Financing Receivable, Total	5,245
Agriculture [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Agriculture [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	310
Financing Receivable, Year Four	53
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	363
Agriculture [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	117
Financing Receivable, Year Two	21
Financing Receivable, Year Three	274
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	412
Multifamily [Member]
Financing Receivable, Year One	18,007
Financing Receivable, Year Two	52,376
Financing Receivable, Year Three	58,201
Financing Receivable, Year Four	46,659
Financing Receivable, Year Five	16,025
Financing Receivable, Prior	734
Financing Receivable, Revolving	1,564
Financing Receivable, Total	193,566
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	(0)	(0)
Multifamily [Member] \| Pass [Member]
Financing Receivable, Year One	13,969
Financing Receivable, Year Two	49,639
Financing Receivable, Year Three	49,826
Financing Receivable, Year Four	44,291
Financing Receivable, Year Five	14,330
Financing Receivable, Prior	734
Financing Receivable, Revolving	1,564
Financing Receivable, Total	174,353
Multifamily [Member] \| Watch [Member]
Financing Receivable, Year One	4,038
Financing Receivable, Year Two	1,447
Financing Receivable, Year Three	8,375
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	13,860
Multifamily [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Multifamily [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	1,290
Financing Receivable, Year Three	0
Financing Receivable, Year Four	2,368
Financing Receivable, Year Five	1,695
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	5,353
Multifamily [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Consumer and Other [Member]
Financing Receivable, Year One	2,177
Financing Receivable, Year Two	5,704
Financing Receivable, Year Three	4,268
Financing Receivable, Year Four	2,536
Financing Receivable, Year Five	777
Financing Receivable, Prior	993
Financing Receivable, Revolving	36
Financing Receivable, Total	16,491
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	(0)	9
Consumer and Other [Member] \| Pass [Member]
Financing Receivable, Year One	2,146
Financing Receivable, Year Two	5,703
Financing Receivable, Year Three	4,268
Financing Receivable, Year Four	2,520
Financing Receivable, Year Five	777
Financing Receivable, Prior	993
Financing Receivable, Revolving	36
Financing Receivable, Total	16,443
Consumer and Other [Member] \| Watch [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	1
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	1
Consumer and Other [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Consumer and Other [Member] \| Substandard [Member]
Financing Receivable, Year One	31
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	31
Consumer and Other [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	16
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	16
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	24,598
Financing Receivable, Year Two	86,008
Financing Receivable, Year Three	91,459
Financing Receivable, Year Four	93,892
Financing Receivable, Year Five	27,234
Financing Receivable, Prior	18,237
Financing Receivable, Revolving	9,571
Financing Receivable, Total	350,999
Current-period gross writeoffs, Year One	0
Current-period gross writeoffs, Year Two	0
Current-period gross writeoffs, Year Three	0
Current-period gross writeoffs, Year Four	0
Current-period gross writeoffs, Year Five	0
Current-period gross writeoffs, Prior	0
Current-period gross writeoffs, Revolving	0
Current-period gross writeoffs, Total	(0)	(0)
Commercial Real Estate Portfolio Segment [Member] \| Pass [Member]
Financing Receivable, Year One	13,527
Financing Receivable, Year Two	72,328
Financing Receivable, Year Three	70,949
Financing Receivable, Year Four	67,757
Financing Receivable, Year Five	20,043
Financing Receivable, Prior	16,700
Financing Receivable, Revolving	7,129
Financing Receivable, Total	268,433
Commercial Real Estate Portfolio Segment [Member] \| Watch [Member]
Financing Receivable, Year One	1,938
Financing Receivable, Year Two	3,123
Financing Receivable, Year Three	20,485
Financing Receivable, Year Four	23,676
Financing Receivable, Year Five	6,815
Financing Receivable, Prior	1,141
Financing Receivable, Revolving	2,442
Financing Receivable, Total	59,620
Commercial Real Estate Portfolio Segment [Member] \| Special Mention [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	0
Commercial Real Estate Portfolio Segment [Member] \| Substandard [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	10,557
Financing Receivable, Year Three	0
Financing Receivable, Year Four	2,459
Financing Receivable, Year Five	376
Financing Receivable, Prior	396
Financing Receivable, Revolving	0
Financing Receivable, Total	13,788
Commercial Real Estate Portfolio Segment [Member] \| Substandard Impaired [Member]
Financing Receivable, Year One	9,133
Financing Receivable, Year Two	0
Financing Receivable, Year Three	25
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, Total	9,158
Agriculture Real Estate [Member]
Financing Receivable, Year One	6,666
Financing Receivable, Year Two	37,077
Financing Receivable, Year Three	39,833

Note 7 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Term Loans by Year of Origination (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

Financing Receivable, Year One

$ 93,329

Financing Receivable, Year Two

345,962

Financing Receivable, Year Three

296,441

Financing Receivable, Year Four

246,398