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Note 5 - Loans Receivable and Credit Disclosures - Activity in Allowance for Loan Losses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance, beginning	$ 12,619,000	$ 11,684,000
Provision for loan losses	5,680,656	1,314,104
Recoveries of loans charged-off	325,000	72,000
Loans charged-off	(1,410,000)	(451,000)
Balance, ending	17,215,000	12,619,000
Construction Real Estate [Member]
Balance, beginning	672,000	699,000
Provision for loan losses	52,000	(27,000)
Recoveries of loans charged-off	1,000	0
Loans charged-off	0	0
Balance, ending	725,000	672,000
Family Residential Real Estate 1-4 [Member]
Balance, beginning	2,122,000	1,820,000
Provision for loan losses	471,000	372,000
Recoveries of loans charged-off	6,000	5,000
Loans charged-off	(18,000)	(75,000)
Balance, ending	2,581,000	2,122,000
Commercial Real Estate Portfolio Segment [Member]
Balance, beginning	5,362,000	4,615,000
Provision for loan losses	3,986,000	732,000
Recoveries of loans charged-off	26,000	15,000
Loans charged-off	(444,000)	0
Balance, ending	8,930,000	5,362,000
Agriculture Real Estate [Member]
Balance, beginning	1,326,000	1,198,000
Provision for loan losses	269,000	128,000
Recoveries of loans charged-off	0	0
Loans charged-off	0	0
Balance, ending	1,595,000	1,326,000
Commercial Portfolio Segment [Member]
Balance, beginning	1,458,000	1,777,000
Provision for loan losses	609,000	(24,000)
Recoveries of loans charged-off	14,000	36,000
Loans charged-off	(628,000)	(331,000)
Balance, ending	1,453,000	1,458,000
Agriculture [Member]
Balance, beginning	1,478,000	1,384,000
Provision for loan losses	266,000	94,000
Recoveries of loans charged-off	0	0
Loans charged-off	(48,000)	0
Balance, ending	1,696,000	1,478,000
Consumer and Other [Member]
Balance, beginning	201,000	191,000
Provision for loan losses	28,000	39,000
Recoveries of loans charged-off	278,000	16,000
Loans charged-off	(272,000)	(45,000)
Balance, ending	$ 235,000	$ 201,000

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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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 expense related to estimated loss from loan and lease transactions.

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