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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2025
Dec. 31, 2024
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock, shares (in shares) 117,115 111,323
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 38,838,884 38,838,884
Common stock, shares issued (in shares) 30,989,991 30,943,349
Common Class B [Member]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 1,161,116 1,161,116
Common stock, shares issued (in shares) 580,558 527,780
Common stock, shares outstanding (in shares) 580,558 527,780