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Note 6 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Securities sold under agreements to repurchase	$ 204,271,000	$ 197,463,000
Average daily balance during the period	198,949,000	158,855,000
Maximum daily balance during the period	$ 224,345,000	$ 209,093,000
Securities Sold under Agreements to Repurchase [Member]
Average interest rate at end of period	0.10%	0.11%
Average interest rate during the period	0.10%	0.11%

X

- Definition

The average effective interest rate during the reporting period.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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