Acquisitions (Details 6) (Crosstex subsidiary, ConFirm Monitoring Systems, Inc., USD $)	0 Months Ended
	Feb. 11, 2011 item	Jan. 31, 2012
Acquisitions
Transaction costs	$ 52,000
Total consideration for the transaction, excluding transaction costs	7,500,000
Maximum amount of contingent consideration payable upon achievement of sales levels	1,000,000
Contingent consideration	656,000
Contingent consideration liability		855,000
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Current assets	1,399,000
Property, plant and equipment	93,000
Current liabilities:
Accounts payable	(244,000)
Deferred revenue	(1,226,000)
Net assets acquired	2,922,000
Number of in-process research and development projects acquired	0
Goodwill deductible for income tax purposes	5,234,000
Period for income tax deduction	15 years
Customer relationships
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	2,290,000
Estimated useful lives	10 years
Brand name
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	470,000
Estimated useful lives	6 years
Technology
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	110,000
Estimated useful lives	5 years
Non-compete agreement
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	$ 30,000
Estimated useful lives	8 years