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INCOME TAXES - Deferred Tax Assets and Liabilities (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Deferred tax assets:    
Accounts receivable $ 528,579 $ 672,056
Accrued vacation 1,479,598 1,252,560
Stock-based compensation 221,199 334,383
Accrued liabilities 903,536 629,906
Total deferred tax assets 2,911,713 2,543,624
Deferred tax liabilities:    
Other comprehensive income 15,181 4,718
Depreciation 2,158,251 1,930,401
Total deferred tax liabilities $ 1,952,233 $ 1,589,838