Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale, amortized cost	$ 263,148	$ 272,319
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)	4,484,614	4,480,976
Treasury stock, common, share (in shares)	4,644,048	4,647,686
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale, amortized cost	$ 207,450	$ 216,621
Other Debt Obligations [Member]
Securities available for sale, amortized cost	$ 55,698	$ 55,698