FINANCING ARRANGEMENTS (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Financing arrangements
Outstanding balance	$ 7,983,140	$ 7,983,140	$ 7,923,487
Long-term debt - net of current maturities	4,148,570	4,148,570	2,865,899
Line of credit
Financing arrangements
Maximum borrowing capacity	13,500,000	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)	3.20%	3.30%
Outstanding balance	7,983,140	7,983,140	7,923,487
Unused availability supported by entity's borrowing base	4,300,000	4,300,000
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)	3.70%	3.60%
Real estate term note maturing on March 31, 2027
Financing arrangements
Debt instrument, face amount	1,800,000	1,800,000
Real estate term note expiring on May 31, 2012
Financing arrangements
Debt instrument, face amount	900,000	900,000
Term loan
Financing arrangements
Long-term debt - net of current maturities	1,100,000	1,100,000
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