Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of operations by geographic segment
Subtotal	$ 2,237	$ 2,392	$ 4,688	$ 3,374
Net sales	40,922	43,197	77,907	83,124
Segment net income (loss)	55	1,548	(1,068)	3,512
Depreciation and amortization	1,717	1,445	3,410	2,669
Total assets	186,787	178,055	186,787	178,055	183,849
Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	43,159	45,589	82,595	86,498
Eliminations [Member]
Schedule of operations by geographic segment
Subtotal	(2,237)	(2,392)	(4,688)	(3,374)
Mobile communication [Member] \| United States [Member]
Schedule of operations by geographic segment
Subtotal	21,645	20,122	42,641	37,674
Mobile communication [Member] \| Canada [Member]
Schedule of operations by geographic segment
Subtotal	95	121	281	283
Mobile communication [Member] \| Europe [Member]
Schedule of operations by geographic segment
Subtotal	5,694	4,906	11,543	8,509
Mobile communication [Member] \| Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	2,230	2,103	4,174	3,693
Guidance and stabilization [Member] \| United States [Member]
Schedule of operations by geographic segment
Subtotal	2,725	1,826	4,698	2,863
Guidance and stabilization [Member] \| Canada [Member]
Schedule of operations by geographic segment
Subtotal	2,339	4,593	5,521	7,883
Guidance and stabilization [Member] \| Europe [Member]
Schedule of operations by geographic segment
Subtotal	869	1,748	1,970	4,458
Guidance and stabilization [Member] \| Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	5,325	7,778	7,079	17,761
Americas [Member]
Schedule of operations by geographic segment
Subtotal	1,376	1,935	2,952	2,540
Net sales	33,613	36,847	63,361	72,538
Segment net income (loss)	635	2,414	(561)	3,614
Depreciation and amortization	1,129	1,123	2,260	2,273
Total assets	126,758	130,208	126,758	130,208
Americas [Member] \| Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	34,989	38,782	66,313	75,078
Americas [Member] \| Eliminations [Member]
Schedule of operations by geographic segment
Subtotal	(1,376)	(1,935)	(2,952)	(2,540)
Americas [Member] \| Mobile communication [Member] \| United States [Member]
Schedule of operations by geographic segment
Subtotal	21,229	19,945	41,906	37,497
Americas [Member] \| Mobile communication [Member] \| Canada [Member]
Schedule of operations by geographic segment
Subtotal	78	121	248	283
Americas [Member] \| Mobile communication [Member] \| Europe [Member]
Schedule of operations by geographic segment
Subtotal	186	110	213	228
Americas [Member] \| Mobile communication [Member] \| Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	862	726	1,726	1,565
Americas [Member] \| Guidance and stabilization [Member] \| United States [Member]
Schedule of operations by geographic segment
Subtotal	2,725	1,826	4,698	2,863
Americas [Member] \| Guidance and stabilization [Member] \| Canada [Member]
Schedule of operations by geographic segment
Subtotal	2,339	4,593	5,521	7,883
Americas [Member] \| Guidance and stabilization [Member] \| Europe [Member]
Schedule of operations by geographic segment
Subtotal	869	1,748	1,970	4,458
Americas [Member] \| Guidance and stabilization [Member] \| Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	5,325	7,778	7,079	17,761
Europe and Asia [Member]
Schedule of operations by geographic segment
Subtotal	861	457	1,736	834
Net sales	7,309	6,350	14,546	10,586
Segment net income (loss)	(580)	(866)	(507)	(102)
Depreciation and amortization	588	322	1,150	396
Total assets	60,029	47,847	60,029	47,847
Europe and Asia [Member] \| Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	8,170	6,807	16,282	11,420
Europe and Asia [Member] \| Eliminations [Member]
Schedule of operations by geographic segment
Subtotal	(861)	(457)	(1,736)	(834)
Europe and Asia [Member] \| Mobile communication [Member] \| United States [Member]
Schedule of operations by geographic segment
Subtotal	416	177	735	177
Europe and Asia [Member] \| Mobile communication [Member] \| Canada [Member]
Schedule of operations by geographic segment
Subtotal	17	0	33	0
Europe and Asia [Member] \| Mobile communication [Member] \| Europe [Member]
Schedule of operations by geographic segment
Subtotal	5,508	4,796	11,330	8,281
Europe and Asia [Member] \| Mobile communication [Member] \| Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	1,368	1,377	2,448	2,128
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