Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jun. 30, 2011
Assets
Cash and cash equivalents	$ 37,442	$ 59,357
Accounts receivable, less allowances (December 31, 2011-$1,457 and June 30, 2011-$1,428)	115,695	103,483
Costs and estimated earnings in excess of billings on uncompleted contracts	56,530	40,056
Inventories	2,581	2,249
Deferred income taxes	5,672	5,607
Other current assets	3,363	4,798
Total current assets	221,283	215,550
Property, plant and equipment at cost:
Land and buildings	28,355	28,287
Construction equipment	58,133	55,272
Transportation equipment	24,488	21,690
Office equipment and software	15,915	15,442
Construction in progress	1,342	2,465
Property, plant and equipment at cost, gross	128,233	123,156
Accumulated depreciation	(74,138)	(69,845)
Property, plant and equipment at cost, net	54,095	53,311
Goodwill	28,905	29,058
Other intangible assets	6,727	6,953
Other assets	4,588	1,564
Total assets	315,598	306,436
Liabilities and stockholders' equity
Accounts payable	48,814	36,377
Billings on uncompleted contracts in excess of costs and estimated earnings	31,816	35,485
Accrued insurance	7,254	7,514
Accrued wages and benefits	13,331	18,099
Other accrued expenses	5,089	2,701
Total current liabilities	106,304	100,176
Deferred income taxes	5,877	5,789
Acquisition payable	800	800
Total liabilities	112,981	106,765
Commitments and contingencies
Stockholders' equity:
Common stock-$.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of December 31, 2011, and June 30, 2011	279	279
Additional paid-in capital	114,913	113,686
Retained earnings	110,771	100,231
Accumulated other comprehensive income	715	1,436
Total stockholders' equity before treasury stock	226,678	215,632
Less: Treasury stock, at cost-2,169,927 shares as of December 31, 2011, and 1,417,539 shares as of June 30, 2011	(24,061)	(15,961)
Total stockholders' equity	202,617	199,671
Total liabilities and stockholders' equity	$ 315,598	$ 306,436