SIGNIFICANT ACCOUNTING POLICIES - Borrowings (Details) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2017 |
Apr. 30, 2017 |
Dec. 31, 2016 |
Nov. 30, 2015 |
|
| Debt Instrument [Line Items] | ||||
| Mortgage balance | $ 25,452,000 | $ 17,538,000 | ||
| Revolving Credit Facility | ||||
| Debt Instrument [Line Items] | ||||
| Revolving credit facility | 15,000,000 | |||
| Proceeds from revolving credit facility | 10,333,000 | |||
| Repayments of long-term debt | 2,133,000 | |||
| Revolving credit facility with Squadron | Revolving Credit Facility | ||||
| Debt Instrument [Line Items] | ||||
| Additional revolving loan commitment | $ 16,000,000 | |||
| Mortgage balance | 3,921,000 | 4,500,000 | ||
| Note payable to Squadron | ||||
| Debt Instrument [Line Items] | ||||
| Additional revolving loan commitment | $ 16,000,000 | $ 7,000,000 | ||
| Mortgage balance | 20,000,000 | $ 11,401,000 | ||
| Loan transfers | $ 4,100,000 |