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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2023
Dec. 31, 2022
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Class A [Member]    
Common stock, authorized (in shares) 60,000,000  
Common stock, outstanding (in shares) 42,149,927 42,345,361
Treasury Stock, Common, Shares (in shares) 2,041,809 1,626,777
Common Class B [Member]    
Common stock, authorized (in shares)   20,000,000
Common stock, outstanding (in shares) 12,307,852 12,083,085
Treasury Stock, Common, Shares (in shares) 1,168,432 1,112,446