Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	7,855,381	7,567,868
Treasury stock, shares (in shares)	1,611,371	1,578,554
Allowance for doubtful accounts	$ 1,752	$ 1,667
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	70,988,987	57,326,180
Treasury stock, shares (in shares)	4,882,705	4,814,716