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Note 8 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans receivable	$ 1,094,651,000	$ 1,060,846,000
Allowance for loan losses	(14,909,000)	(12,619,000)	$ (11,812,000)	$ (11,684,000)
Deferred loan fees	(85,000)	(80,000)
Loans receivable, net	1,079,657,447	1,048,147,496
Construction Real Estate [Member]
Loans receivable	49,768,000	47,895,000
Allowance for loan losses	(753,000)	(672,000)	(736,000)	(699,000)
Family Residential Real Estate 1-4 [Member]
Loans receivable	204,791,000	201,510,000
Allowance for loan losses	(2,336,000)	(2,122,000)	(1,850,000)	(1,820,000)
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	461,505,000	435,850,000
Allowance for loan losses	(6,552,000)	(5,362,000)	(4,770,000)	(4,615,000)
Agriculture Real Estate [Member]
Loans receivable	161,984,000	160,771,000
Allowance for loan losses	(1,563,000)	(1,326,000)	(1,258,000)	(1,198,000)
Commercial Portfolio Segment [Member]
Loans receivable	85,743,000	84,084,000
Allowance for loan losses	(1,672,000)	(1,458,000)	(1,610,000)	(1,777,000)
Agriculture [Member]
Loans receivable	112,406,000	111,945,000
Allowance for loan losses	(1,815,000)	(1,478,000)	(1,392,000)	(1,384,000)
Consumer and Other [Member]
Loans receivable	18,454,000	18,791,000
Allowance for loan losses	$ (218,000)	$ (201,000)	$ (196,000)	$ (191,000)

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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