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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Apr. 30, 2021
Stock Issued During Period, Value, New Issues	$ 133,000	$ 175,000
Stock Repurchased During Period, Shares (in shares)	25,899
Stock Repurchased During Period, Value	$ 682,000
Stock Repurchased, Price Per Share (in dollars per share)	$ 26.35
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)			390,114
Stock Repurchase Program, Percent of Stock Outstanding			5.00%
Directors' Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,698
Stock Issued During Period, Value, New Issues	$ 98,000
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,634
Stock Issued During Period, Value, New Issues	$ 35,000

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