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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule of operations by geographic segment
Intercompany sales	$ 982	$ 3,417
Net sales	39,927	26,728
Segment net income (loss)	1,963	(1,375)
Depreciation and amortization	1,224	1,115
Total assets	145,303	122,053	137,568
Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	40,909	30,145
Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(982)	(3,417)
Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	17,482	14,050
Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	162	148
Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	3,602	4,415
Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	1,661	2,218
Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	1,443	913
Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	2,954	2,566
Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	2,710	2,037
Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	9,913	381
Americas [Member]
Schedule of operations by geographic segment
Intercompany sales	605	2,993
Net sales	35,692	21,148
Segment net income (loss)	1,200	(1,271)
Depreciation and amortization	1,150	980
Total assets	125,565	102,716
Americas [Member] | Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	36,297	24,141
Americas [Member] | Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(605)	(2,993)
Americas [Member] | Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	17,482	14,050
Americas [Member] | Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	162	148
Americas [Member] | Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	118	125
Americas [Member] | Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	910	928
Americas [Member] | Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	1,443	913
Americas [Member] | Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	2,954	2,566
Americas [Member] | Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	2,710	2,037
Americas [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	9,913	381
Europe and Asia [Member]
Schedule of operations by geographic segment
Intercompany sales	377	424
Net sales	4,235	5,580
Segment net income (loss)	763	(104)
Depreciation and amortization	74	135
Total assets	19,738	19,337
Europe and Asia [Member] | Subtotal [Member]
Schedule of operations by geographic segment
Subtotal	4,612	6,004
Europe and Asia [Member] | Eliminations [Member]
Schedule of operations by geographic segment
Intercompany sales	(377)	(424)
Europe and Asia [Member] | Mobile communication [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	0	0
Europe and Asia [Member] | Mobile communication [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	0	0
Europe and Asia [Member] | Mobile communication [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	3,484	4,290
Europe and Asia [Member] | Mobile communication [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	751	1,290
Europe and Asia [Member] | Guidance and stabilization [Member] | United States [Member]
Schedule of operations by geographic segment
Subtotal	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Canada [Member]
Schedule of operations by geographic segment
Subtotal	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Europe [Member]
Schedule of operations by geographic segment
Subtotal	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Schedule of operations by geographic segment
Subtotal	$ 0	$ 0

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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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