Segment Information - Segment Revenues (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Total Revenues	$ 33,872,000	$ 36,995,000	$ 40,220,000	$ 31,370,000	$ 31,130,000	$ 34,731,000	$ 39,751,000	$ 31,709,000	$ 142,457,342	$ 137,321,395
United States
Total Revenues									124,059,000	119,573,000
Canada
Total Revenues									6,678,000	7,040,000
Europe
Total Revenues									10,062,000	9,288,000
Other International
Total Revenues									1,658,000	1,420,000
Total International
Total Revenues									$ 18,398,000	$ 17,748,000