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Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
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Jun. 30, 2018 USD ($)
Property, Plant and Equipment [Line Items] |
Restricted cash | $ 0.3
Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life of intangible assets | 4 years
Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Useful life of intangible assets | 15 years
Building [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 40 years
Construction Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 3 years
Construction Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 15 years
Transportation Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 3 years
Transportation Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 5 years
Office Equipment and Software [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 3 years
Office Equipment and Software [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Depreciable life of office equipment and software | 10 years
International [Member] |
Property, Plant and Equipment [Line Items] |
Cash | $ 5.2

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