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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2012
Dec. 31, 2011
CURRENT ASSETS    
Cash and cash equivalents $ 8,614,244 $ 15,745,559
Trade accounts receivable 35,640,758 19,351,023
Cost and estimated earnings in excess of billings on uncompleted contracts 6,263,943 5,101,478
Prepaid expenses and other 1,824,779 1,606,936
Total current assets 52,343,724 41,804,996
PROPERTY AND EQUIPMENT - at cost    
Machinery and equipment 190,943,331 139,017,290
Automobiles and trucks 15,265,627 12,616,608
Furniture and fixtures 488,779 434,146
Leasehold improvements 14,994 14,994
Total property and equipment, gross 206,712,731 152,083,038
Less accumulated depreciation and amortization (117,326,964) (94,286,207)
Total property and equipment, net 89,385,767 57,796,831
Goodwill 201,530 201,530
Other assets 96,817 77,870
Total noncurrent assets 298,347 279,400
Total assets 142,027,838 99,881,227
CURRENT LIABILITIES    
Trade accounts payable 13,680,538 9,256,392
Accrued liabilities 5,544,071 2,598,126
Billings in excess of costs and estimated earnings on uncompleted contracts 3,757,349 937,755
Federal and state income tax payable 4,569,891 2,017,644
Current maturities of notes payable 10,615,279 5,802,513
Current portion of capital lease obligations 1,960,503 1,336,037
Total current liabilities 40,127,631 21,948,467
NOTES PAYABLE, less current maturities 14,412,598 5,328,892
CAPITAL LEASE OBLIGATIONS, less current portion 1,884,937 1,626,612
LONG-TERM DEFERRED TAX LIABILITY 7,617,111 7,257,576
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; 20,732,500 and 19,348,436 shares issued and outstanding in each period 207,325 193,484
Additional paid-in capital 29,573,986 28,176,922
Retained earnings 48,073,556 35,499,541
Treasury stock, at cost; 80,076 and 37,820 shares in each period (691,009) (257,394)
Accumulated other comprehensive income 821,703 107,127
Total shareholders' equity 77,985,561 63,719,680
Total liabilities and shareholders' equity $ 142,027,838 $ 99,881,227