Debt (Details)					3 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Dansensor USD ($)	Mar. 31, 2013 Dansensor DKK	Mar. 31, 2013 Secured term note payable USD ($)	Mar. 31, 2013 Revolving line of credit USD ($)	Mar. 31, 2013 Seller financed secured note payable USD ($)	Mar. 31, 2013 Bank term note payable and seller financed secured note payable USD ($)
Bank Financing
Note payable to the bank, with interest at 3.46%, payable in monthly principal installments of $72,917 plus interest through March 28, 2016, collateralized by all the assets of the Company except Dansensor stock	$ 2,697,913	$ 2,916,664
Seller financed note payable (Seller Note), with interest at 3.46%, payable in semi-annual principal and interest payments totaling $891,000 beginning October 2, 2012 through April 2, 2015, collateralized by 65% of the outstanding stock of Dansensor.	3,409,887	3,517,067
Capital leases	54,288	59,286
Total long-term notes payable	6,162,088	6,493,017
Less current portion of long-term notes payable	2,511,471	2,566,154
Total long-term notes payable	3,650,617	3,926,863
Financial covenants not in compliance for which a waiver was granted by bank	1
Fixed interest rate (as a percent)					3.46%		3.46%
Monthly principal installments					72,917
Semi-annual installments payable of principal and interest							891,000
Maximum borrowing capacity			1,700,000	10,000,000		5,000,000
Reference rate						one-month LIBOR
Basis spread over reference rate (as a percent)						0.0175%
Interest rate at the end of period (as a percent)						2.00%
Outstanding revolving line of credit			932,000	5,400,000		3,650,000
Interest rate charged on borrowings (as a percent)			4.35%	4.35%
Financial covenants, amount of borrowings	6,300,000
Future minimum principal payments of the long- term notes payable
2013								2,511,471
2014								2,572,614
2015								989,572
2016								87,015
2017								1,416
Total long-term notes payable								$ 6,162,088