Note 2 - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts-beginning of year	$ 2,170	$ 1,932
(Recovery of) provision for bad debt reserve	(433)	291
Write-off	(263)	(53)
Allowance for doubtful accounts-end of year	$ 1,474	$ 2,170