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Note 7 - Restricted Investment in Stocks (Details Textual)	3 Months Ended
	Mar. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 29, 2022
Investment Holdings [Line Items]
Restricted investment in stocks	$ 2,098,000	$ 5,193,000
Other than temporary impairment charge of restricted investment	0
Investment in Federal Home Loan Bank Stock [Member]
Investment Holdings [Line Items]
Restricted investment in stocks	1,086,000
Investment in Atlantic Community Bankers Bank Stock [Member]
Investment Holdings [Line Items]
Restricted investment in stocks	12,000
Investment In SHCPFIC Preferred Stock [Member]
Investment Holdings [Line Items]
Restricted investment in stocks	$ 1,000,000
Number of shares owned \| shares	100
VISA Class B Stock [Member]
Investment Holdings [Line Items]
Restricted investment in stocks	$ 0
Number of shares owned \| shares	6,502
VISA Class A Stock [Member]
Investment Holdings [Line Items]
Conversion factor per share			1.5991