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

3 Months Ended

Mar. 31, 2019

Notes Tables

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

		March 31, 2019			December 31, 2018
Accounts receivable	$	218,832		$	220,455
Allowance		(14,037	)		(13,683	)
Accounts receivable, net	$	204,795		$	206,772

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

		March 31,  2019			December 31,  2018
Balance--beginning of period	$	13,683		$	14,799
Provision		5,411			20,453
Charge-offs		(5,057	)		(21,569	)
Balance--end of period	$	14,037		$	13,683