FINANCING ARRANGEMENTS (Details)			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Jul. 01, 2015 USD ($) item	Mar. 31, 2017 USD ($)	Jun. 30, 2017	Dec. 31, 2016 USD ($)
Financing arrangements
Weighted-average interest rate (as a percent)			3.40%
Total long-term debt	$ 5,682,583		$ 5,682,583		$ 6,585,298
Discount on Devicix Notes Payable	(92,511)		(92,511)		(102,424)
Debt Issuance Costs	(21,326)		(21,326)		(25,896)
Long-term Debt	5,568,746		5,568,746		6,456,978
Current maturities of long-term debt	(1,571,111)		(1,571,111)		(1,565,347)	[1]
Long-term debt - net of current maturities	3,997,635		3,997,635		4,891,631	[1]
Devicix LLC
Financing arrangements
Number of promissory notes | item		2
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)	3.40%		3.40%
Outstanding balance	$ 8,050,426		$ 8,050,426		$ 7,315,262
Minimum fixed charge coverage ratio					1.20
Minimum fixed charge coverage ratio thereafter					1.15
Unused availability supported by entity's borrowing base	$ 4,900,000		$ 4,900,000
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)	3.90%		3.90%
Principal and interest payments			$ 19,000
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 2 maturing on December 31, 2027
Financing arrangements
Debt instrument, face amount	1,700,000		1,700,000
Tenth Amendment To Third Amended and Restated Credit and Security Agreement
Financing arrangements
Minimum fixed charge coverage ratio				1.05
Minimum fixed charge coverage ratio thereafter				1.10
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
Industrial revenue bond payable to the City of Blue Earth, Minnesota
Financing arrangements
Interest rate (as a percent)	0.25%		0.25%
Amount of annual principal payments	$ 80,000		$ 80,000
Long-term Debt	200,000		$ 200,000		$ 200,000
Equipment notes maturing in May 2018
Financing arrangements
Variable rate basis			three month LIBOR
Interest rate margin on variable rate basis (as a percent)			2.75%
Long-term Debt	2,442,411		$ 2,442,411		2,489,624
Principal and interest payments			46,000
Real estate term notes
Financing arrangements
Net proceeds used to pay down the principle on the debt	657,000
Long-term Debt	$ 1,701,390		$ 1,701,390		2,415,428
Devicix Acq Note 1, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)	4.00%		4.00%
Long-term Debt	$ 582,079		$ 582,079		643,585
Devicix Acq Note 2, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)	4.00%		4.00%
Long-term Debt	$ 756,703		$ 756,703		$ 836,661
Promissory note subject to offsets | Devicix LLC
Financing arrangements
Promissory note liability		$ 1,000,000
Term of promissory note		4 years
Interest rate per annum		4.00%
Principal and interest payments		$ 22,579
Promissory note not subject to offsets | Devicix LLC
Financing arrangements
Promissory note liability		$ 1,300,000
Term of promissory note		4 years
Interest rate per annum		4.00%
Principal and interest payments		$ 29,353

[1] The balance sheet at December 31, 2016 has been derived from the audited financial statements at that date