Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Allowance for doubtful accounts (in Dollars)	$ 1,711	$ 1,667
Common stock, par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	70,988,567	57,326,180
Treasury stock, shares	4,882,705	4,814,716
Common Class A [Member]
Common stock, par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,855,381	7,567,868
Treasury stock, shares	1,611,371	1,578,554