6. Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Net Sales:
Customer sales	$ 9,487	$ 10,036	$ 30,914	$ 29,458
Intercompany sales	0	0	0	0
Total Net Sales	9,487	10,036	30,914	29,458
Net (loss) income	(329)	291	(109)	622
Segment assets	36,944	38,596	36,944	38,596	$ 35,729
Inter-Company Eliminations [Member]
Net Sales:
Customer sales	0	0	0	0
Intercompany sales	(989)	(3,438)	(5,842)	(9,095)
Total Net Sales	(989)	(3,438)	(5,842)	(9,095)
Net (loss) income	(33)	(21)	(74)	(25)
Segment assets	(402)	0	(402)	0
United States (Corpus Christi) [Member]
Net Sales:
Customer sales	5,385	7,227	19,454	20,596
Intercompany sales	0	34	37	87
Total Net Sales	5,385	7,261	19,491	20,683
Net (loss) income	(164)	9	(238)	(269)
Segment assets	15,834	17,819	15,834	17,819
European (TPT) [Member]
Net Sales:
Customer sales	2,882	2,249	8,361	6,954
Intercompany sales	492	2,051	3,303	5,336
Total Net Sales	3,374	4,300	11,664	12,290
Net (loss) income	(286)	325	(171)	892
Segment assets	15,872	14,478	15,872	14,478
Asian (TMM) [Member]
Net Sales:
Customer sales	1,220	560	3,099	1,908
Intercompany sales	497	1,353	2,502	3,672
Total Net Sales	1,717	1,913	5,601	5,580
Net (loss) income	154	(22)	374	24
Segment assets	$ 5,640	$ 6,299	$ 5,640	$ 6,299