Liquidity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Feb. 27, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Presentation and Liquidity [Line Items]
Cash	$ 1,725,000	$ 2,153,000	$ 1,725,000	$ 2,153,000		$ 1,938,000	$ 2,294,000
Working capital	2,319,000		2,319,000
Net loss	(714,000)	$ 198,000	(1,217,000)	(635,000)
Net cash provided by operating activities			1,382,000	$ 1,560,000
Comerica Bank [Member] | Colorado [Member]
Organization, Presentation and Liquidity [Line Items]
Letters of credit outstanding, amount	116,000		116,000			185,000
Main Street Capital Corporation [Member] | Senior secured term loan facility [Member]
Organization, Presentation and Liquidity [Line Items]
Revolving loan facility, maximum borrowing capacity					$ 11,000,000
Main Street Term Loan	9,000,000		9,000,000			9,000,000
Revolving loan facility, unused borrowing capacity	2,000,000		2,000,000
Main Street Capital Corporation [Member] | Senior secured revolving loan facility [Member]
Organization, Presentation and Liquidity [Line Items]
Revolving loan facility, maximum borrowing capacity					$ 2,000,000
Main Street Revolver	21,000		21,000			$ 400,000
Revolving loan facility, unused borrowing capacity	$ 1,979,000		$ 1,979,000