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Note 8 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing receivable, recorded investment, past due	$ 11,511	$ 7,866
Financing receivable, recorded investment, current	1,083,140	1,052,980
Loans receivable	1,094,651	1,060,846
Financing receivable, recorded investment, 90 days past due and still accruing	838	255
Construction Real Estate [Member]
Financing receivable, recorded investment, past due	410	1,796
Financing receivable, recorded investment, current	49,358	46,099
Loans receivable	49,768	47,895
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due	1,289	1,101
Financing receivable, recorded investment, current	203,502	200,409
Loans receivable	204,791	201,510
Financing receivable, recorded investment, 90 days past due and still accruing	122	188
Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due	266	387
Financing receivable, recorded investment, current	461,239	435,463
Loans receivable	461,505	435,850
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due	2,872	422
Financing receivable, recorded investment, current	159,112	160,349
Loans receivable	161,984	160,771
Financing receivable, recorded investment, 90 days past due and still accruing	682	0
Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due	1,950	755
Financing receivable, recorded investment, current	83,793	83,329
Loans receivable	85,743	84,084
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Agriculture [Member]
Financing receivable, recorded investment, past due	4,643	3,253
Financing receivable, recorded investment, current	107,763	108,692
Loans receivable	112,406	111,945
Financing receivable, recorded investment, 90 days past due and still accruing	30	62
Consumer and Other [Member]
Financing receivable, recorded investment, past due	81	152
Financing receivable, recorded investment, current	18,373	18,639
Loans receivable	18,454	18,791
Financing receivable, recorded investment, 90 days past due and still accruing	4	5
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable, recorded investment, past due	6,048	4,746
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due	410	1,796
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due	1,009	811
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due	83	387
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due	1,474	422
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due	1,469	518
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due	1,545	666
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due	58	146
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, past due	5,463	3,120
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due	280	290
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due	183
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due	1,398	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due	481	237
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due	3,098	2,587
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due	$ 23	$ 6

X

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Amount of financing receivable 90 days or more past due and still accruing.

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