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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of operations by geographic segment
Intercompany sales	$ 2,392	$ 4,263	$ 3,374	$ 7,681
Net sales	43,197	32,019	83,124	58,747
Segment net income (loss)	1,548	453	3,512	(922)
Depreciation and amortization	1,445	1,091	2,669	2,206
Total assets	178,055	126,664	178,055	126,664	137,568
Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	45,589	36,282	86,498	66,428
Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(2,392)	(4,263)	(3,374)	(7,681)
Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	20,122	16,471	37,674	30,593
Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	121	217	283	365
Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	4,906	5,440	8,509	9,853
Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	2,103	1,916	3,693	4,063
Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	1,826	2,369	2,863	3,258
Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	4,593	2,641	7,883	5,207
Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	1,748	2,314	4,458	4,351
Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	7,778	651	17,761	1,057
Americas [Member]
Schedule of operations by geographic segment
Intercompany sales	1,935	3,637	2,540	6,631
Net sales	36,847	25,432	72,538	46,581
Segment net income (loss)	2,414	896	3,614	(375)
Depreciation and amortization	1,123	1,012	2,273	1,991
Total assets	130,208	106,111	130,208	106,111
Americas [Member] | Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	38,782	29,069	75,078	53,212
Americas [Member] | Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(1,935)	(3,637)	(2,540)	(6,631)
Americas [Member] | Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	19,945	16,471	37,497	30,593
Americas [Member] | Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	121	217	283	365
Americas [Member] | Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	110	119	228	243
Americas [Member] | Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	726	650	1,565	1,507
Americas [Member] | Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	1,826	2,369	2,863	3,258
Americas [Member] | Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	4,593	2,641	7,883	5,207
Americas [Member] | Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	1,748	2,314	4,458	4,351
Americas [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	7,778	651	17,761	1,057
Europe and Asia [Member]
Schedule of operations by geographic segment
Intercompany sales	457	626	834	1,050
Net sales	6,350	6,587	10,586	12,166
Segment net income (loss)	(866)	(443)	(102)	(547)
Depreciation and amortization	322	79	396	215
Total assets	47,847	20,553	47,847	20,553
Europe and Asia [Member] | Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	6,807	7,213	11,420	13,216
Europe and Asia [Member] | Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(457)	(626)	(834)	(1,050)
Europe and Asia [Member] | Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	177	0	177	0
Europe and Asia [Member] | Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	0	0	0	0
Europe and Asia [Member] | Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	4,796	5,321	8,281	9,610
Europe and Asia [Member] | Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	1,377	1,266	2,128	2,556
Europe and Asia [Member] | Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	0	0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	0	0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	0	0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	$ 0	$ 0	$ 0	$ 0

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