Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2012

Allowance for Credit Losses on Financing Receivables [Table Text Block]

	2012			2011		2010
Balance, at beginning of year	$	3,309		$	2,768	$	2,405
Charged to expense		428			397		451
Write-offs and adjustments		(485	)		144		(88	)
Balance, at end of year	$	3,252		$	3,309	$	2,768

Schedule of Other Assets and Other Liabilities [Table Text Block]

	2012			2011
Costs incurred on uncompleted contracts	$	667,231		$	599,242
Estimated earnings to date		184,322			171,983
Subtotal		851,553			771,225
Less – billings to date		(812,590	)		(727,977	)
Total	$	38,963		$	43,248
Included in the accompanying balance sheets:
Costs and estimated earnings in excess of billings		70,515			67,683
Billings in excess of costs and estimated earnings		(31,552	)		(24,435	)
Total	$	38,963		$	43,248

Schedule of Inventory, Current [Table Text Block]

	2012		2011
Raw materials and supplies	$	16,636	$	17,353
Work-in-process		8,876		6,767
Finished products		18,056		11,902
Construction materials		15,941		18,518
Total	$	59,509	$	54,540

Property, Plant and Equipment [Table Text Block]

	Estimated Useful Lives (Years)			2012			2011
Land and land improvements				$	11,988		$	12,725
Buildings and improvements	5	–	40		64,706			64,810
Machinery and equipment	4	–	10		179,858			176,997
Furniture and fixtures	3	–	10		17,037			16,611
Autos and trucks	3	–	10		50,167			48,855
Construction in progress					36,048			15,263
Subtotal					359,804			335,261
Less – Accumulated depreciation					(173,838	)		(166,316	)
Total				$	185,966		$	168,945

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	2012		2011
Vendor and other accrued expenses	$	34,903	$	29,818
Estimated casualty and healthcare liabilities		12,899		13,684
Job costs		14,077		14,654
Accrued compensation		12,943		10,454
Income tax payable and deferred income taxes		6,418		807
Total	$	81,240	$	69,417