FINANCING ARRANGEMENTS (Details) - USD ($)		3 Months Ended	6 Months Ended
	May. 07, 2015	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Financing arrangements
Costs and fees related to amended credit agreement	$ 54,838		$ 54,838
Debt Issuance Costs		$ 53,315	53,315
Total debt		5,676,433	5,676,433	$ 4,805,341
Less current maturities		857,027	857,027	732,835
Long-term debt - net of current maturities		4,819,406	4,819,406	4,072,506
Line of credit
Financing arrangements
Maximum borrowing capacity		$ 15,000,000	$ 15,000,000
Variable rate basis			three-month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.25%
Interest rate (as a percent)		2.50%	2.50%
Weighted-average interest rate (as a percent)		2.80%	2.80%
Outstanding balance		$ 8,471,042	$ 8,471,042	7,998,184
Unused availability supported by entity's borrowing base		$ 5,500,000	$ 5,500,000
Real estate term note
Financing arrangements
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%
Real estate term note maturing on March 31, 2027
Financing arrangements
Debt instrument, face amount		$ 1,800,000	$ 1,800,000
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt		1,356,228	$ 1,356,228	1,415,461
Real estate term note 2 maturing on December 31, 2027
Financing arrangements
Debt instrument, face amount		1,700,000	$ 1,700,000
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt		1,404,300	$ 1,404,300	1,460,100
Term loan
Financing arrangements
Outstanding balance		1,000,000	1,000,000
Term loan | Maximum
Financing arrangements
Debt instrument, face amount		1,000,000	1,000,000
Equipment term loan tied to equipment purchased in Mankato acquisition
Financing arrangements
Debt instrument, face amount		2,700,000	$ 2,700,000
Equipment Loan Due January 2016
Financing arrangements
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt				102,917
Equipment Loan One Due May 2018
Financing arrangements
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt				1,117,863
Equipment Loan Two Due May 2018
Financing arrangements
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt				349,000
Equipment Loan Three Due May 2018
Financing arrangements
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Total debt		2,689,220	$ 2,689,220
Industrial revenue bond payable to the City of Blue Earth, Minnesota
Financing arrangements
Total debt		$ 280,000	$ 280,000	$ 360,000