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INCENTIVE PLANS (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2017 | Nov. 30, 2010 | May 03, 2005
Stock Options |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Compensation expense (income) | $ 126,000 | $ 43,000 |  |  |  |
Unrecognized compensation related to unvested awards | $ 160,000 |  |  |  |  |
Unrecognized compensation, vesting period | 4 years 18 days |  |  |  |  |
Options |  |  |  |  |  |
Balance at the beginning of the period(in shares) | 187,750 | 37,750 |  |  |  |
Granted (in shares) | 134,000 | 150,000 |  |  |  |
Cancelled (in shares) | (97,000) |  |  |  |  |
Balance at the end of the period (in shares) | 224,750 | 187,750 | 37,750 |  |  |
Exercisable at the end of the period (in shares) | 44,750 |  |  |  |  |
Weighted-Average Exercise Price Per Share |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 3.70 | $ 4.75 |  |  |  |
Granted (in dollars per share) | 3.36 | 3.43 |  |  |  |
Cancelled (in dollars per share) | (3.84) |  |  |  |  |
Outstanding at the end of the period (in dollars per share) | 3.44 | $ 3.70 | $ 4.75 |  |  |
Exercisable at the end of the period (in dollars per share) | $ 3.65 |  |  |  |  |
Weighted- Average Remaining Contractual Term (in years) |  |  |  |  |  |
Outstanding at the end of the period | 8 years 7 months 6 days | 8 years 1 month 17 days |  |  |  |
Exercisable at the end of the period | 6 years 7 months 2 days |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Outstanding at the end of the period | $ 52,715 | $ 74,070 |  |  |  |
Exercisable at the end of the period | 8,075 |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Intrinsic value of options exercised | $ 0 | $ 0 |  |  |  |
Stock Options | Minimum |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Purchase price as a percentage of market value | 100.00% |  |  |  |  |
Exercisable period | 1 year |  |  |  |  |
Stock Options | Maximum |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Expiration term | 10 years |  |  |  |  |
2003 Plan | Stock Options |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Number of shares eliminated |  |  |  |  |  | 172,500
2005 Plan | Stock Options |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Shares available for grant | 0 |  |  |  |  | 200,000
Options |  |  |  |  |  |
Granted (in shares) |  | 0 | 0 |  |  |
2010 Plan | Equity Appreciation Rights Plan |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Compensation expense (income) | $ 0 | $ (22,000) |  |  |  |
Equity Appreciation Rights Plan |  |  |  |  |  |
Vesting period from the base date | 3 years |  |  |  |  |
Shares granted (in units) |  | 100,000 | 31,666 |  |  |
Accrued compensation liability |  |  |  |  |  |
Beginning Balance |  | $ 45,000 |  |  |  |
Reductions |  | (22,000) |  |  |  |
Payments |  | $ (23,000) |  |  |  |
Ending Balance |  |  | $ 45,000 |  |  |
2010 Plan | Equity Appreciation Rights Plan | Maximum |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Number of common shares authorized |  |  |  |  | 1,000,000 |
Equity Appreciation Rights Plan |  |  |  |  |  |
Redemption cash payment period | 90 days |  |  |  |  |
2017 Plan | Stock Options |  |  |  |  |  |
Incentive plans |  |  |  |  |  |
Number of common shares authorized |  |  |  | 350,000 |  |
Options |  |  |  |  |  |
Granted (in shares) | 134,000 | 150,000 |  |  |  |

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