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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
$ / shares in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized Unlimited Unlimited
Preferred stock, shares outstanding (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized Unlimited Unlimited
Common Stock, Shares, Outstanding (in shares) 30,450,881 30,436,964