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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 26,713	$ 25,549
Preferred stock par value	$ 0.0001	$ 0.0001
Preferred stock authorized	7,500,000	7,500,000
Preferred stock issued	0	0
Preferred stock outstanding	0	0
Common Class A [Member]
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	80,000,000	80,000,000
Common stock issued	24,884,265	24,679,127
Common stock outstanding	24,704,772	24,678,545
Common Class B [Member]
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	20,000,000	20,000,000
Common stock issued	5,096,421	5,107,674
Common stock outstanding	5,095,504	5,106,757
Treasury Class-A [Member]
Treasury Stock, Shares	179,493	582
Treasury Class B [Member]
Treasury Stock, Shares	917	917

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