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Note 3 - Securities - Securities With Unrealized Losses (Details)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
US Treasury Securities [Member]
Count, less than 12 months	53
Collateralized mortgage obligations - residential, fair value	$ 62,246,000
Unrealized loss, less than 12 months	$ (76,000)
Count, total	53
Fair value, total	$ 62,246
Unrealized loss, total	$ (76,000)
Collateralized Mortgage Backed Securities [Member]
Count, less than 12 months		0
Collateralized mortgage obligations - residential, fair value		$ 0
Unrealized loss, less than 12 months		$ 0
Count, total		3
Fair value, total		$ 1,588,000
Unrealized loss, total		$ (1,000)
Count, 12 months or more		3
Fair value, 12 months or more		$ 1,588,000
Unrealized loss, 12 months or more		$ (1,000)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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