Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale, amortized cost	$ 225,005	$ 233,478
Serial-preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Serial-preferred stock, shares authorized (in shares)	500,000	500,000
Serial-preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	16,000,000	16,000,000
Common stock, shares issued (in shares)	9,128,662	9,128,662
Common Stock, Shares, Outstanding (in shares)	4,462,555	4,457,905
Treasury stock, common, share (in shares)	4,666,107	4,670,757
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, amortized cost	$ 170,784	$ 179,366
Other Debt Obligations [Member]
Securities available for sale, amortized cost	$ 54,221	$ 54,112