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Subsequent Events (Details) - USD ($) |  |  | 6 Months Ended
--- | --- | --- | ---
Aug. 07, 2018 | Jul. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Subsequent Event [Line Items] |  |  |  |
Purchase price of MUSA, cash held in escrow |  |  | $ 10,378,281 | $ 0
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price of MUSA, cash held in escrow |  | $ 10,378,281 |  |
Dividends declared (in usd per share) | $ 0.25 |  |  |

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- Definition Payments To Acquire Businesses, Amount Held In Escrow + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- 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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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