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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Preferred stock, authorized (in shares) 100,000 100,000
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized (in shares) 15,000,000 15,000,000
Common stock, outstanding (in shares) 7,521,749 7,516,098