12. SUPPLEMENTAL CASH FLOW INFORMATION (Details) - Supplemental cash flow information - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 606,697	$ 724,651	$ 856,578
Federal, state and local income taxes paid - net of refunds	339,625	5,568,581	972,645
Fixed asset purchases in accounts payable	$ 216,523	$ 92,903	$ 85,488