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FINANCING ARRANGEMENTS (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2015 USD ($) item | Dec. 31, 2018 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 15, 2017 USD ($)
Financing arrangements |  |  |  |  |
Loss on Extinguishment of Debt |  |  | $ 174,834 |  |
Total long-term debt |  |  | 5,656,872 | $ 6,585,298 |
Discount on Devicix Notes Payable |  |  | (62,776) | (102,424) |
Debt Issuance Costs |  |  | (238,468) | (25,896) |
Long-term Debt |  |  | 5,355,628 | 6,456,978 |
Current maturities of long-term debt |  |  | (1,002,586) | (1,565,347) |
Long-term debt - net of current maturities |  |  | 4,353,042 | 4,891,631 |
Future maturity requirements for long-term debt |  |  |  |  |
2018 |  |  | 1,095,722 |  |
2019 |  |  | 805,880 |  |
2020 |  |  | 497,892 |  |
2021 |  |  | 497,892 |  |
2022 |  |  | 497,892 |  |
Future |  |  | 2,261,594 |  |
Total long-term debt |  |  | $ 5,656,872 | 6,585,298 |
Devicix, LLC |  |  |  |  |
Financing arrangements |  |  |  |  |
Number of promissory notes | item | 2 |  |  |  |
Line of credit |  |  |  |  |
Financing arrangements |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  | 3.74% |  |
Outstanding balance |  |  | $ 8,502,853 | 7,315,262 |
Unused availability supported by entity's borrowing base |  |  | 4,231,000 | $ 5,710,602 |
Line of credit | Maximum |  |  |  |  |
Financing arrangements |  |  |  |  |
Interest rate margin on variable rate basis (as a percent) |  |  |  | 3.75% |
Line of credit | Minimum |  |  |  |  |
Financing arrangements |  |  |  |  |
Interest rate margin on variable rate basis (as a percent) |  |  |  | 3.25% |
Real estate term note 2 maturing on December 31, 2027 |  |  |  |  |
Financing arrangements |  |  |  |  |
Maximum borrowing capacity |  |  | 3,500,000 |  |
Capital Term loan |  |  |  |  |
Financing arrangements |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,000,000 |
Outstanding balance |  |  |  | 684,000 |
Capital Term loan | Maximum |  |  |  |  |
Financing arrangements |  |  |  |  |
Debt instrument, face amount |  |  | 1,000,000 |  |
Equipment term loan tied to equipment purchased in Mankato acquisition |  |  |  |  |
Financing arrangements |  |  |  |  |
Debt instrument, face amount |  |  | 2,700,000 |  |
Industrial revenue bond payable to the City of Blue Earth, Minnesota |  |  |  |  |
Financing arrangements |  |  |  |  |
Long-term Debt |  |  |  | 200,000 |
Principal and interest payments |  |  | $ 80,000 |  |
Devicix Acq Note 1, subordinate debt, due July 1, 2019 |  |  |  |  |
Financing arrangements |  |  |  |  |
Interest rate (as a percent) |  |  | 4.00% |  |
Long-term Debt |  |  | $ 393,834 | 643,585 |
Devicix Acq Note 2, subordinate debt, due July 1, 2019 |  |  |  |  |
Financing arrangements |  |  |  |  |
Interest rate (as a percent) |  |  | 4.00% |  |
Long-term Debt |  |  | $ 511,984 | 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
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) |  |  | 4.50% |  |
Long-term Debt |  |  | $ 4,751,054 |  |
Principal and interest payments |  |  | 41,000 |  |
Bank of America | Credit Agreement |  |  |  |  |
Financing arrangements |  |  |  |  |
Minimum fixed charge coverage ratio |  | 1.00 |  |  |
Wells Fargo Bank, N.A. |  |  |  |  |
Financing arrangements |  |  |  |  |
Loss on Extinguishment of Debt |  |  | $ 174,834 |  |
Wells Fargo Bank, N.A. | Line of credit |  |  |  |  |
Financing arrangements |  |  |  |  |
Maximum borrowing capacity |  |  |  | 15,000,000 |
Outstanding balance |  |  |  | 7,315,262 |
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 |
Wells Fargo Bank, N.A. | 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 |

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