Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 27,973	$ 32,471
Preferred stock par value	$ 0.0001	$ 0.0001
Preferred stock authorized	7,500,000us-gaap_PreferredStockSharesAuthorized	7,500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Class A [Member]
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	80,000,000	80,000,000
Common stock issued	23,971,808	23,680,749
Common stock outstanding	23,971,686	23,680,627
Common Class B [Member]
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	20,000,000	20,000,000
Common stock issued	5,098,799	5,096,780
Common stock outstanding	5,097,882	5,095,863
Treasury Class-A [Member]
Treasury Stock, Shares	122	122
Treasury Class B [Member]
Treasury Stock, Shares	917	917

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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