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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