Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
allowance for doubtful accounts	$ 8,673	$ 8,086
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000	10,000
Series 2012-A Preferred Stock [Member]
Preferred stock, designated (in shares)	8,750	8,750
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	35,000	35,000
Common stock, issued (in shares)	1,574	1,574
Common stock, outstanding (in shares)	1,574	1,574
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	200,000	200,000
Common stock, issued (in shares)	29,323	29,310
Common stock, outstanding (in shares)	25,178	25,482
Treasury stock, shares (in shares)	4,146	3,828