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FINANCING ARRANGEMENTS (Details)
3 Months Ended 6 Months Ended
Jul. 01, 2015
USD ($)
item
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 15, 2017
USD ($)
Dec. 31, 2016
USD ($)
Financing arrangements          
Loss on Extinguishment of Debt   $ 174,834 $ 174,834    
Total long-term debt   6,315,900 6,315,900   $ 6,585,298
Discount on Devicix Notes Payable   (82,600) (82,600)   (102,424)
Debt Issuance Costs   (264,660) (264,660)   (25,896)
Long-term Debt   5,968,640 5,968,640   6,456,978
Current maturities of long-term debt   (1,064,876) (1,064,876)   (1,565,347) [1]
Long-term debt - net of current maturities   $ 4,903,764 $ 4,903,764   4,891,631 [1]
Devicix LLC          
Financing arrangements          
Number of promissory notes | item 2        
Line of credit          
Financing arrangements          
Weighted-average interest rate (as a percent)   3.65% 3.51%    
Outstanding balance   $ 6,642,937 $ 6,642,937   7,315,262
Unused availability supported by entity's borrowing base   $ 7,392,337 $ 7,392,337    
Industrial revenue bond payable to the City of Blue Earth, Minnesota          
Financing arrangements          
Interest rate (as a percent)   0.21% 0.21%    
Amount of annual principal payments   $ 80,000 $ 80,000    
Long-term Debt   $ 120,000 $ 120,000   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         2,489,624
Principal and interest payments     $ 46,000    
Devicix Acq Note 1, subordinate debt, due July 1, 2019          
Financing arrangements          
Interest rate (as a percent)   4.00% 4.00%    
Long-term Debt   $ 519,956 $ 519,956   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   $ 675,944 $ 675,944   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        
Bank of America | Line of credit          
Financing arrangements          
Maximum borrowing capacity       $ 16,000,000  
Variable rate basis     one-month LIBOR    
Interest rate margin on variable rate basis (as a percent)     2.00%    
Interest rate (as a percent)   3.25% 3.25%    
Bank of America | Real estate term notes          
Financing arrangements          
Debt instrument, face amount       $ 5,000,000  
Variable rate basis     one-month LIBOR    
Interest rate margin on variable rate basis (as a percent)     2.25%    
Interest rate (as a percent)   3.50% 3.50%    
Long-term Debt   $ 5,000,000 $ 5,000,000    
Principal and interest payments     $ 41,000    
Bank of America | Credit Agreement          
Financing arrangements          
Minimum fixed charge coverage ratio   1.00 1.00    
Wells Fargo Bank, N.A          
Financing arrangements          
Loss on Extinguishment of Debt   $ 174,834 $ 174,834    
Wells Fargo Bank, N.A | Real estate term notes          
Financing arrangements          
Variable rate basis     three-month LIBOR    
Interest rate margin on variable rate basis (as a percent)     2.75%    
Long-term Debt         $ 2,415,428
Principal and interest payments     $ 19,000    
[1] The balance sheet at December 31, 2016 has been derived from the audited financial statements at that date