Note 2 - Accounts Receivable and Allowance for Doubtful Accounts (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	March 31, 2017			December 31, 2016
Accounts receivable	$	176,589		$	184,354
Allowance		(9,985	)		(10,772	)
Accounts receivable, net	$	166,604		$	173,582

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

	March 31, 2017
Balance--beginning of period	$	10,772
Provision		4,038
Charge-offs		(4,825	)
Recoveries		-
Balance--end of period	$	9,985