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SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] - USD ($) | Sep. 06, 2018 | Sep. 10, 2018
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Subsequent Event [Line Items] |  |
Sales of batteries subject to product recall |  | $ 338,000
Value of commercial product recall inventory |  | 1,000,000
Insurance deductible per occurrence of product recall |  | $ 50,000
Credit Agreement, with Minnesota Bank and Trust [Member] |  |
Subsequent Event [Line Items] |  |
Loan origination fees | $ 60,000 |
Credit Agreement, with Minnesota Bank and Trust [Member] | Revolving Loan [Member] |  |
Subsequent Event [Line Items] |  |
Proceeds from issuance of debt | $ 2,000,000 |
Maturity date | Sep. 06, 2019 |
Interest rate | 4.50% |
Default interest rate increased | 3.00% |
Late payment percentage charge | 5.00% |
Credit Agreement, with Minnesota Bank and Trust [Member] | Revolving Loan [Member] | Prime Rate [Member] |  |
Subsequent Event [Line Items] |  |
Interest rate description | The Revolving Loan matures on September 6, 2019 unless earlier terminated pursuant to its terms and bears interest at the greater of (a) 4.5% or (b) the difference of the prime rate as published in the Money Rates section of the Wall Street Journal minus 0.50%. |
Interest rate, basis spread on variable rate | 0.50% |
Credit Agreement, with Minnesota Bank and Trust [Member] | Term Loan [Member] |  |
Subsequent Event [Line Items] |  |
Proceeds from issuance of debt | $ 5,000,000 |
Maturity date | Oct. 01, 2025 |
Interest rate | 5.53% |
Periodic payment | $ 71,921.43 |
Default interest rate increased | 3.00% |

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