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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Change in federal corporate tax rate |  | 24.00%
Change in income tax expense |  | $ 306
Minimum [Member] |  |
Change in federal corporate tax rate | 21.00% |

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- Definition Change in federal corporate tax rate. + References No definition available. + Details
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- Definition Reduction income tax expense. + References No definition available. + Details
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Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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