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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]    
Revenues $ 226,217 $ 209,608
Cost of revenues 200,741 187,364
Gross profit 25,476 22,244
Selling, general and administrative expenses 14,714 14,320
Operating income 10,762 7,924
Other income (expense):    
Interest expense (223) (183)
Interest income 5 8
Other (88) 57
Income before income tax expense 10,456 7,806
Provision for federal, state and foreign income taxes 3,904 3,122
Net income $ 6,552 $ 4,684
Basic earnings per common share (US$ per share) $ 0.25 $ 0.18
Diluted earnings per common share (US$ per share) $ 0.25 $ 0.18
Weighted average common shares outstanding:    
Basic (shares) 26,116 25,788
Diluted (shares) 26,647 26,148