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SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions | Dec. 05, 2018 | Dec. 05, 2017 | Dec. 07, 2016 | Nov. 30, 2018
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Subsequent Event [Line Items] |  |  |  |
Repurchase period |  |  | 1 year |
Share Repurchase Program [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repurchase period |  | 1 year |  |
Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repurchase period | 1 year |  |  |
Disposed of by Sale [Member] | Commercial Property [Member] | Property in Minot, ND [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Sale price |  |  |  | $ 6.6

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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X
- Details
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Namespace Prefix: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |