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Revolving credit agreement (Narrative Details) (Details) (USD $)	12 Months Ended		0 Months Ended		3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	May 31, 2014	Feb. 20, 2014	Jun. 30, 2014	Mar. 31, 2014	Nov. 19, 2014	Sep. 30, 2014	Dec. 01, 2014
Debt Instrument [Line Items]
Current note payable	$ 800,000us-gaap_NotesPayableCurrent	$ 0us-gaap_NotesPayableCurrent
Principal payments on lines of credit	433,000us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Letter of Credit [Member] \| Texas Capital Bank [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity				25,000,000
Revolving Credit Facility [Member] \| Texas Capital Bank [Member]
Debt Instrument [Line Items]
Minimum borrowing capacity			800,000	1,450,000
Debt instrument interest rate (percent)				50.00%
Proceeds from lines of credit					365,000	868,000
Principal payments on lines of credit			433,000
Maximum amount outstanding during period			1,230,000
Amortization of financing costs	34,586
Interest expense	30,595
Revolving Credit Facility [Member] \| Texas Capital Bank [Member] \| Loans Payable [Member]
Debt Instrument [Line Items]
Debt instrument interest rate (percent)				100.00%
Revolving Credit Facility [Member] \| Texas Capital Bank [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Debt instrument interest rate (percent)				200.00%
Subsidiaries [Member] \| Revolving Credit Facility [Member] \| Texas Capital Bank [Member]
Debt Instrument [Line Items]
Current ratio during current period								0.10
Current note payable	800,000
Minimum [Member] \| Subsidiaries [Member] \| Revolving Credit Facility [Member] \| Texas Capital Bank [Member]
Debt Instrument [Line Items]
Cash interest ratio				3.5
Current ratio				1.0
Current ratio waived under event of default agreement							1.00
Navitus Partners, LLC [Member] \| Subsidiaries [Member] \| Revolving Credit Facility [Member] \| Texas Capital Bank [Member]
Debt Instrument [Line Items]
Amount to be received from partner to satisfy covenant terms									$ 1,500,000