6. Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Net Sales:
Customer sales	$ 10,036	$ 8,988	$ 29,458	$ 29,066
Intercompany sales	0	0	0	0
Total Net Sales	10,036	8,988	29,458	29,066
Net Income (Loss)	291	(121)	622	(418)
Assets	38,596	43,471	38,596	43,471	$ 36,708
Intersegment Eliminations [Member]
Net Sales:
Customer sales	0	0	0	0
Intercompany sales	(3,438)	(2,240)	(9,095)	(7,836)
Total Net Sales	(3,438)	(2,240)	(9,095)	(7,836)
Net Income (Loss)	(21)	180	(25)	113
Assets	0	0	0	0
United States (Corpus Christi) [Member]
Net Sales:
Customer sales	7,227	6,308	20,596	20,485
Intercompany sales	34	33	87	37
Total Net Sales	7,261	6,341	20,683	20,522
Net Income (Loss)	9	(229)	(269)	(327)
Assets	17,819	17,026	17,819	17,026
Europe (TPT) [Member]
Net Sales:
Customer sales	2,249	2,059	6,954	6,418
Intercompany sales	2,051	1,418	5,336	3,456
Total Net Sales	4,300	3,477	12,290	9,874
Net Income (Loss)	325	138	892	152
Assets	14,478	13,769	14,478	13,769
Asia (TMM) [Member]
Net Sales:
Customer sales	560	621	1,908	2,163
Intercompany sales	1,353	789	3,672	4,343
Total Net Sales	1,913	1,410	5,580	6,506
Net Income (Loss)	(22)	(210)	24	(356)
Assets	$ 6,299	$ 12,676	$ 6,299	$ 12,676