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Note 12 - Subsequent Events	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	12.  Subsequent Events On April 14, 2021, the board of directors of the Company declared a cash dividend and authorized a stock repurchase program. On April 16, 2021, the Company entered into a commitment with a contractor to build a new branch in West Des Moines, Iowa for $1.7 million. Management evaluated subsequent events through the date the financial statements were issued. There were no significant events or transactions occurring after March 31, 2021, but prior to May 4, 2021, that provided additional evidence about conditions that existed at March 31, 2021. There were no other significant events or transactions that provided evidence about conditions that did not exist at March 31, 2021.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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