Consolidated Balance Sheets (Current Period Unaudited)-parentheticals (Parentheticals) - $ / shares	Sep. 30, 2022	Dec. 31, 2021
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Class A [Member]
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares outstanding (in shares)	42,373,737	43,018,498
Treasury stock, shares (in shares)	1,493,121	183,765
Common Class B [Member]
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares outstanding (in shares)	12,092,098	12,474,589
Treasury stock, shares (in shares)	1,103,433	416,069