Note 6 - Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31
	2018			2017
Finished goods	$	5,677		$	4,415
Work-in-process		3,105			2,501
Raw materials		8,103			8,078
Provisions for obsolete inventories		(6,597	)		(5,664	)
Total	$	10,288		$	9,330

Provisions for Obsolete Inventories [Table Text Block]

	Years Ended December 31
	2018			2017			2016
Balance at beginning of year	$	5,664		$	5,041		$	3,664
Charge to cost and expenses		1,328			642			1,527
Other deductions		(395	)		(19	)		(150	)
Balance at end of year	$	6,597		$	5,664		$	5,041