Note 3 - Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]

	As of December 31,
	2018			2017
Balance, beginning of period	$	64		$	50
Provision for doubtful accounts		40			30
Write-offs		(37	)		(16	)
Balance, end of period	$	67		$	64