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Segment Reporting (Details) (USD $)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Intercompany sales										$ 10,549,000	$ 8,877,000	$ 6,941,000
Net sales										137,112,210	112,535,864	112,242,794
Segment net income (loss)	2,757,000	1,745,000	453,000	(1,375,000)	1,604,000	600,000	190,000	(1,534,000)	3,580,615	3,580,615	859,649	8,273,212
Depreciation and amortization										4,609,654	4,374,169	3,845,016
Total assets	137,567,807				128,555,714					137,567,807	128,555,714	115,198,000
Subtotal [Member]
Segment Reporting Information [Line Items]
Subtotal										147,661,000	121,413,000	119,184,000
Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales										(10,549,000)	(8,877,000)	(6,941,000)
Mobile communication [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										62,857,000	50,797,000	46,358,000
Mobile communication [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										777,000	875,000	571,000
Mobile communication [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										15,672,000	13,682,000	10,922,000
Mobile communication [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										8,379,000	4,848,000	4,622,000
Guidance and stabilization [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										8,632,000	11,951,000	24,262,000
Guidance and stabilization [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										10,736,000	16,643,000	5,353,000
Guidance and stabilization [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										11,793,000	7,877,000	17,368,000
Guidance and stabilization [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										18,266,000	5,863,000	2,787,000
Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales										8,485,000	7,793,000	6,528,000
Net sales										117,414,000	95,724,000	98,385,000
Segment net income (loss)										4,317,000	396,000	8,201,000
Depreciation and amortization										4,116,000	3,948,000	3,711,000
Total assets	118,076,000				112,557,000					118,076,000	112,557,000	101,116,000
Americas [Member] | Subtotal [Member]
Segment Reporting Information [Line Items]
Subtotal										125,899,000	103,517,000	104,913,000
Americas [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales										(8,485,000)	(7,793,000)	(6,528,000)
Americas [Member] | Mobile communication [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										62,857,000	50,797,000	46,358,000
Americas [Member] | Mobile communication [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										777,000	875,000	571,000
Americas [Member] | Mobile communication [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										417,000	438,000	524,000
Americas [Member] | Mobile communication [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										3,936,000	1,280,000	1,162,000
Americas [Member] | Guidance and stabilization [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										8,632,000	11,951,000	24,262,000
Americas [Member] | Guidance and stabilization [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										10,736,000	16,643,000	5,353,000
Americas [Member] | Guidance and stabilization [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										11,793,000	7,877,000	17,368,000
Americas [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										18,266,000	5,863,000	2,787,000
Europe and Asia [Member]
Segment Reporting Information [Line Items]
Intercompany sales										2,064,000	1,084,000	413,000
Net sales										19,698,000	16,812,000	13,858,000
Segment net income (loss)										(736,000)	464,000	72,000
Depreciation and amortization										494,000	426,000	134,000
Total assets	19,492,000				15,999,000					19,492,000	15,999,000	14,082,000
Europe and Asia [Member] | Subtotal [Member]
Segment Reporting Information [Line Items]
Subtotal										21,762,000	17,896,000	14,271,000
Europe and Asia [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales										(2,064,000)	(1,084,000)	(413,000)
Europe and Asia [Member] | Mobile communication [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										0	0	0
Europe and Asia [Member] | Mobile communication [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										0	0	0
Europe and Asia [Member] | Mobile communication [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										15,255,000	13,244,000	10,398,000
Europe and Asia [Member] | Mobile communication [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										4,443,000	3,568,000	3,460,000
Europe and Asia [Member] | Guidance and stabilization [Member] | United States [Member]
Segment Reporting Information [Line Items]
Subtotal										0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Subtotal										0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Subtotal										0	0	0
Europe and Asia [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]
Segment Reporting Information [Line Items]
Subtotal										$ 0	$ 0	$ 0

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