Note 6 - Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Inventory Current and Noncurrent [Table Text Block]

	June 30 , 2019		December 31, 2018
Current:
Raw materials	$	482	$	1,795
Finished goods		11,776		11,433
	$	12,258	$	13,228
Long-term:
Raw materials	$	2,039	$	2,165
Finished goods		5,676		6,788
	$	7,715	$	8,953

Inventory Write-off [Table Text Block]

	Three months ended June 30,						Six months ended June 30,
	2019			2018			2019			2018
Net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory	$	(183	)	$	(170	)	$	(368	)	$	(425	)