Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details Textual)

Acquisitions Acquisitions (Details Textual) (USD $)	12 Months Ended						12 Months Ended			3 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended		12 Months Ended
Acquisitions Acquisitions (Details Textual) (USD $)	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 CSI [Member]	Mar. 31, 2013 CSI [Member]	Mar. 31, 2012 CSI [Member]	Mar. 31, 2014 Kentrox [Member]	Mar. 31, 2013 Kentrox [Member]	Mar. 31, 2012 Kentrox [Member]	Mar. 31, 2014 CSI [Member]	Mar. 31, 2014 CSI [Member]	Mar. 02, 2014 CSI [Member]	Mar. 31, 2014 CSI [Member] Product Technology [Member]	Mar. 02, 2014 CSI [Member] Product Technology [Member]	Mar. 31, 2014 CSI [Member] Customer Relationships [Member]	Mar. 02, 2014 CSI [Member] Customer Relationships [Member]	Mar. 31, 2013 Kentrox [Member]	Mar. 31, 2014 Kentrox [Member]	Mar. 31, 2013 Kentrox [Member]	Apr. 02, 2013 Kentrox [Member]	Mar. 31, 2014 Kentrox [Member] Product Technology [Member]	Apr. 02, 2013 Kentrox [Member] Product Technology [Member]	Mar. 31, 2014 Kentrox [Member] Customer Relationships [Member]	Apr. 02, 2013 Kentrox [Member] Customer Relationships [Member]	Apr. 02, 2013 Kentrox [Member] Scenario, Adjustment [Member]	Mar. 31, 2014 Antone Wireless Corporation [Member]	Mar. 31, 2013 Antone Wireless Corporation [Member]	May 15, 2012 Antone Wireless Corporation [Member]	Mar. 31, 2014 Antone Wireless Corporation [Member] Product Technology [Member]	May 15, 2012 Antone Wireless Corporation [Member] Product Technology [Member]	Mar. 31, 2014 Antone Wireless Corporation [Member] Customer Relationships [Member]	May 15, 2012 Antone Wireless Corporation [Member] Customer Relationships [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired												100.00%								100.00%
Payments to Acquire Businesses, Gross											$ 39,000,000							$ 30,000,000									$ 2,500,000
Working Capital Adjustment												4,700,000								1,300,000
Business Combination, Acquisition Related Costs										200,000							300,000										100,000
Revenue	102,073,000	38,808,000	43,629,000	3,676,000			46,174,000
Operating Income (Loss)	(3,314,000)	(13,325,000)	(1,947,000)								(300,000)								7,300,000
Goodwill	30,697,000	0	801,000	20,142,000			10,555,000					20,142,000								10,555,000					2,584,000			2,086,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	3,500,000	3,500,000																										3,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill												16,230,000		3,860,000		10,980,000				15,980,000		4,410,000		8,960,000	(990,000)			3,230,000		2,800,000		400,000
Finite-Lived Intangible Asset, Useful Life													3 years		7 years						9 years		10 years						8 years		8 years
Specific pre-acquisition ANTONE product warranty in excess of acquired limit		303,000																									300,000
Pre Acquisition Warranty Costs																										$ 25,000