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Note 8 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Financing receivable, recorded investment, past due		$ 23,052	$ 7,866
Financing receivable, recorded investment, current		1,141,597	1,052,980
Loans receivable		1,164,649	1,060,846
Financing receivable, recorded investment, 90 days past due and still accruing		641	255
Construction Real Estate [Member]
Financing receivable, recorded investment, past due		429	1,796
Financing receivable, recorded investment, current		50,616	46,099
Loans receivable		51,045	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		982	1,101
Financing receivable, recorded investment, current		204,272	200,409
Loans receivable		205,254	201,510
Financing receivable, recorded investment, 90 days past due and still accruing		109	188
Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		15,265	387
Financing receivable, recorded investment, current		447,812	435,463
Loans receivable		463,077	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		2,590	422
Financing receivable, recorded investment, current		157,696	160,349
Loans receivable		160,286	160,771
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		1,840	755
Financing receivable, recorded investment, current		156,377	83,329
Loans receivable	[1]	158,217	84,084
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture [Member]
Financing receivable, recorded investment, past due		1,896	3,253
Financing receivable, recorded investment, current		107,170	108,692
Loans receivable		109,066	111,945
Financing receivable, recorded investment, 90 days past due and still accruing		532	62
Consumer and Other [Member]
Financing receivable, recorded investment, past due		50	152
Financing receivable, recorded investment, current		17,654	18,639
Loans receivable		17,704	18,791
Financing receivable, recorded investment, 90 days past due and still accruing		0	5
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable, recorded investment, past due		7,151	4,746
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Financing receivable, recorded investment, past due		429	1,796
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Financing receivable, recorded investment, past due		749	811
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing receivable, recorded investment, past due		4,940	387
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		586	422
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		268	518
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		149	666
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		30	146
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, past due		15,901	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		233	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		10,325	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Financing receivable, recorded investment, past due		2,004	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Financing receivable, recorded investment, past due		1,572	237
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Financing receivable, recorded investment, past due		1,747	2,587
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Financing receivable, recorded investment, past due		$ 20	$ 6
[1] Commercial loan portfolio as of June 30, 2020 includes $78.3 million Payroll Protection Program ("PPP") loans

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