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Financial Instruments and Fair Value Measurements (Details Textual) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 29, 2016 USD ($) payment | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) payment | Dec. 31, 2016 USD ($) | Apr. 22, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on revaluation of contingent consideration |  | $ 1,719,000 | $ 1,719,000 |  |
Land [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Tangible Asset Impairment Charges |  |  | $ 0 | $ 0 |
Initial Montana Acquisition [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Business Combination, Contingent Consideration Maximum | $ 2,000,000 |  |  |  |
Gain on revaluation of contingent consideration |  | $ 1,700,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Number of Periodic Payment | payment | 4 |  | 4 |  |
Business Combination Contingent Consideration Arrangements Quarterly Payments, Start date |  |  | 2017-09 |  |
Fair value of intangible assets acquired | $ 14,400,000 |  |  |  |
Initial Montana Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] | Non-Recurring Basis [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of intangible assets acquired | $ 14,400,000 |  |  |  |
Second Montana Acquisition [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  | $ 11,400,000
Second Montana Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] | Non-Recurring Basis [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  | $ 11,400,000

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- Definition Amount of increase (decrease) in the value of right to a contingent consideration asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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