Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2025	Dec. 31, 2024
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)	105,000,000	105,000,000
Common stock, outstanding (in shares)	61,123,036	62,604,986
Treasury Stock, Common, Shares (in shares)	3,243,834	1,387,013
Common Class B [Member]
Common stock, authorized (in shares)	35,000,000	35,000,000
Common stock, outstanding (in shares)	16,614,652	16,662,633
Treasury Stock, Common, Shares (in shares)	2,156,419	1,783,806