Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]    
Rental expense $ 1,500,000 $ 704,000
Outstanding performance and payment bonds $ 8,000,000 8,300,000
Estimated costs to complete projects secured by performance and payment bonds   $ 4,400,000