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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 20,205	$ 26,713
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	24,966,035	24,884,265
Common stock outstanding	24,835,804	24,704,772
Common Class B [Member]
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	20,000,000	20,000,000
Common stock issued	5,089,532	5,096,421
Common stock outstanding	5,089,532	5,095,504
Treasury Class-A [Member]
Treasury Stock, Shares	130,231	179,493
Treasury Class B [Member]
Treasury Stock, Shares	0	917

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