Note 3 - Accounts Receivable and Allowance for Doubtful Accounts (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	March 31,  2016			December 31, 2015
Accounts receivable	$	170,953		$	173,995
Allowance for doubtful accounts		(5,157	)		(4,849	)
Accounts receivable, net	$	165,796		$	169,146

Movement in Valuation Allowances and Reserves Roll Forward [Table Text Block]

	Three Months Ended March 31,
	2016			2015
Balance--beginning of period	$	4,849		$	1,898
Provision--allowance for doubtful accounts		3,646			-
Charge-offs		(3,152	)		(420	)
Recoveries		(186	)		-
Balance--end of period	$	5,157		$	1,478