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Summary of Significant Accounting Policies (Schedule of Costs, Estimated Earnings and Billings) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
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Receivables [Abstract] |  |
Costs incurred on uncompleted contracts | $ 5,286 | $ 20,088
Estimated earnings | 1,072 | 6,031
Less: billings to date | (5,605) | (28,179)
Ending balance | $ 753 | $ (2,060)

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