Note 11 - Financial Information about Geographic Areas (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	For the Three Months Ended
	March 31,
	2018		2017
Net sales by geographic region
United States	$	11,198,000	$	10,599,000
International		244,000		152,000
Consolidated net sales	$	11,442,000	$	10,751,000

	March 31,		December 31,
	2018		2017
Long-lived assets by geographic region
United States	$	2,644,000	$	2,593,000
International		471,000		565,000
Consolidated total long-lived assets	$	3,115,000	$	3,158,000