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CONSOLIDATED BALANCE SHEETS (USD $)
Mar. 31, 2013
Dec. 31, 2012
CURRENT ASSETS    
Cash and cash equivalents $ 9,999,433 $ 8,614,244
Trade accounts receivable 37,649,154 35,640,758
Cost and estimated earnings in excess of billings on uncompleted contracts 8,472,820 6,263,943
Prepaid expenses and other 1,156,446 1,824,779
Total current assets 57,277,853 52,343,724
PROPERTY AND EQUIPMENT - at cost    
Machinery and equipment 189,832,081 190,943,331
Automobiles and trucks 15,534,952 15,265,627
Furniture and fixtures 487,406 488,779
Leasehold improvements 14,994 14,994
Total property and equipment, gross 205,869,433 206,712,731
Less accumulated depreciation and amortization (123,486,298) (117,326,964)
Total property and equipment, net 82,383,135 89,385,767
Goodwill 201,530 201,530
Other assets 96,779 96,817
Total noncurrent assets 298,309 298,347
TOTAL ASSETS 139,959,297 142,027,838
CURRENT LIABILITIES    
Trade accounts payable 12,418,785 13,680,538
Accrued liabilities 5,927,730 5,544,071
Billings in excess of costs and estimated earnings on uncompleted contracts 890,201 3,757,349
Federal and state income taxes payable 4,955,535 4,569,891
Current maturities of notes payable 9,933,778 10,615,279
Current portion of capital lease obligations 1,807,779 1,960,503
Total current liabilities 35,933,808 40,127,631
NOTES PAYABLE, less current maturities 12,252,579 14,412,598
CAPITAL LEASE OBLIGATIONS, less current portion 1,685,502 1,884,937
LONG-TERM DEFERRED TAX LIABILITY 6,686,271 7,617,111
COMMITMENTS AND CONTINGENCIES      
SHAREHOLDERS' EQUITY    
Preferred stock, $1.00 par value; 4,000,000 shares authorized; issued - none      
Common stock, $.01 par value; 25,000,000 shares authorized; 20,905,318 and 20,732,500 in each period 209,053 207,325
Additional paid-in capital 30,310,938 29,573,986
Retained earnings 54,425,028 48,073,556
Treasury stock, at cost, 97,816 and 80,076 shares in each period (874,973) (691,009)
Accumulated other comprehensive (loss) income (668,909) 821,703
Total shareholders' equity 83,401,137 77,985,561
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 139,959,297 $ 142,027,838