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Note 11 - Regulatory Matters - Actual Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Boone Bank and Trust [Member]
Tier one leverage capital	$ 14,162	$ 13,967
Tier one leverage capital to average assets	0.094	0.092
Tier one leverage capital required to be well capitalized	$ 12,790	$ 12,170
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080
First National Bank [Member] | Also Conducts Business Out of 3 Full Service Offices in Des Moines Metro Area [Member]
Tier one leverage capital	$ 88,178	$ 86,071
Tier one leverage capital to average assets	0.085	0.086
Tier one leverage capital required to be well capitalized	$ 88,123	$ 80,393
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080
Iowa State Savings Bank [Member]
Tier one leverage capital	$ 21,947	$ 21,610
Tier one leverage capital to average assets	0.093	0.094
Tier one leverage capital required to be well capitalized	$ 20,057	$ 18,321
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080
Reliance State Bank [Member] | Conducts Business Out of Offices at Story City, Garner, and Kleme, Iowa [Member]
Tier one leverage capital	$ 23,671	$ 23,278
Tier one leverage capital to average assets	0.091	0.094
Tier one leverage capital required to be well capitalized	$ 22,015	$ 19,741
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080
State Bank and Trust [Member]
Tier one leverage capital	$ 17,292	$ 16,564
Tier one leverage capital to average assets	0.084	0.085
Tier one leverage capital required to be well capitalized	$ 17,485	$ 15,657
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080
United Bank and Trust [Member]
Tier one leverage capital	$ 10,727	$ 10,539
Tier one leverage capital to average assets	0.091	0.092
Tier one leverage capital required to be well capitalized	$ 9,972	$ 9,180
Tier one leverage capital required to be well capitalized to average assets	0.085	0.080

X

- Definition

Amount of Tier 1 leverage capital as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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X

- Definition

Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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- Definition

Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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