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Acquisitions (Schedule of Purchase price) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Purchase price consideration:    
Cash Consideration, net of cash acquired $ 13,352 $ 14,708
Western State Design [Member]    
Purchase price consideration:    
Cash Consideration, net of cash acquired [1] 13,394  
Stock Consideration [2] 16,053  
Total purchase price consideration, net of cash acquired 29,447  
Tri-State Technical Services [Member]    
Purchase price consideration:    
Cash Consideration, net of cash acquired [3] 6,474  
Stock Consideration [4] 9,027  
Total purchase price consideration, net of cash acquired 15,501  
AA Acquisition [Member]    
Purchase price consideration:    
Cash Consideration, net of cash acquired [5] 7,175  
Stock Consideration [6] 12,349  
Total purchase price consideration, net of cash acquired $ 19,524  
[1] Includes $18.5 million, net of $5.1 million of cash acquired.
[2] Calculated as 2,044,990 shares of common stock, multiplied by $7.85, the closing price of the Company's common stock on the closing date.
[3] Includes $8,250,000 paid net of $1.8 million of cash acquired.
[4] Calculated as 338,115 shares of the Company's common stock, multiplied by $26.70, the closing price of the Company's common stock on the closing date.
[5] Includes $8,119,000 paid at closing (inclusive of a preliminary working capital adjustment) net of $0.9 million of cash acquired.
[6] Calculated as 348,360 shares of the Company's common stock, multiplied by $35.45, the closing price of the Company's common stock on the closing date.