Financing Instruments - Loan and Security Agreement (Details)	Dec. 10, 2013 USD ($) covenant	Sep. 01, 2010 USD ($) covenant	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Aug. 31, 2010 USD ($)
Line of Credit [Member] | Revolver Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 12,000,000			$ 13,000,000
Number of debt covenants | covenant		3
Capital expenditure limit (maximum)		$ 625,000
Percentage of eligible accounts receivable		85.00%
Percentage of eligible inventory		55.00%
Inventory included in base rate calculation (up to)		$ 6,000,000
Fixed charge coverage ratio evaluation period		12 months
Percentage of eligible inventory included in base rate calculation with appraisal		65.00%
Net orderly liquidation value (percent)		85.00%
Outstanding balance on loan			$ 6,736,267	$ 5,435,005
Weighted average interest rate			4.60%	4.30%
Cash available under loan			$ 2,237,428	$ 1,077,892
Line of Credit [Member] | Revolver Loan [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Fixed charge coverage ratio		100.00%
Line of Credit [Member] | Revolver Loan [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
Line of Credit [Member] | Revolver Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
Secured Debt [Member] | Note Purchase Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 7,200,000.0
Period committed to ensure funding before maturity date	90 days
Number of debt covenants | covenant	4
Capital expenditure limit (maximum)	$ 625,000
Fixed charge coverage ratio evaluation period	12 months
Outstanding balance on loan			$ 7,519,026	$ 7,157,852