FINANCING ARRANGEMENTS (Details) (USD $)	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Financing arrangements
Outstanding balance	$ 7,625,468	$ 7,625,468		$ 7,234,983
Long-term debt - net of current maturities	4,289,085	4,289,085		4,246,914
Line of credit
Financing arrangements
Maximum borrowing capacity					13,500,000
Variable rate basis	three-month LIBOR
Interest rate margin on variable rate basis (as a percent)		2.75%
Interest rate (as a percent)	3.00%	3.00%
Weighted-average interest rate (as a percent)		3.00%	3.10%
Outstanding balance	7,625,468	7,625,468		7,234,983
Unused availability supported by entity's borrowing base	5,900,000	5,900,000
Real estate term note
Financing arrangements
Variable rate basis	three-month LIBOR
Interest rate margin on variable rate basis (as a percent)		3.25%
Interest rate (as a percent)	3.50%	3.50%
Weighted-average interest rate (as a percent)		3.40%	3.40%
Real estate term note maturing on March 31, 2027
Financing arrangements
Debt instrument, face amount					1,800,000
Term loan
Financing arrangements
Long-term debt - net of current maturities	1,600,000	1,600,000
Term loan | Maximum
Financing arrangements
Debt instrument, face amount	2,000,000	2,000,000
Equipment term loan tied to equipment purchased in Mankato acquisition
Financing arrangements
Debt instrument, additional borrowing amount					$ 1,700,000