13. SUPPLEMENTAL CASH FLOW INFORMATION (Detail) - Supplemental cash flow information (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest paid	$ 718,117	$ 1,037,301	$ 4,824,238
Federal, state and local income taxes paid - net of refunds	2,671,990	4,690,479	2,810,434
Capitalized interest		1,394	8,330
Fixed asset purchases in accounts payable	$ 618,774	$ 154,170	$ 560,248