Segment Revenues (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Revenues - United States									$ 66,694,000	$ 55,856,000
Revenues - International									17,676,000	17,446,000
Total Revenues	19,535,000	20,363,000	27,594,000	16,878,000	15,836,000	19,036,000	24,029,000	14,401,000	84,369,770	73,301,864
United States
Revenues - United States									66,694,000	55,856,000
Total Revenues									67,510,000	56,663,000
Canada
Revenues - International									8,808,000	8,514,000
Total Revenues									8,808,000	8,514,000
Europe
Revenues - International									8,052,000	8,125,000
Total Revenues									8,052,000	8,125,000
Other International
Revenues - International									$ 816,000	$ 807,000