SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Revenue Recognition, Impact on Condensed Consolidated Statement of Operations (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues [Abstract]
Total revenues		$ 38,187,755	$ 32,961,443
Costs and expenses [Abstract]
General and administrative	$ 2,500,000	9,285,372	8,805,989
Provision for income taxes	1,500,000	5,828,840	4,744,008
Net income	6,183,684	24,469,808	20,053,269
Royalties [Member]
Revenues [Abstract]
Total revenues	9,900,000	$ 38,187,755	32,921,764
Adjusted / Balances Without Adoption of New Revenue Standard [Member] | ASU 2014-09 [Member]
Costs and expenses [Abstract]
General and administrative	2,400,000		8,700,000
Provision for income taxes	1,000,000		4,500,000
Net income	5,200,000		19,100,000
Adjusted / Balances Without Adoption of New Revenue Standard [Member] | ASU 2014-09 [Member] | Royalties [Member]
Revenues [Abstract]
Total revenues	8,500,000		31,700,000
Adjustments / Effect of Change Higher / (Lower) [Member] | ASU 2014-09 [Member]
Costs and expenses [Abstract]
General and administrative	100,000		100,000
Provision for income taxes	500,000		200,000
Net income	1,000,000		1,000,000
Adjustments / Effect of Change Higher / (Lower) [Member] | ASU 2014-09 [Member] | Royalties [Member]
Revenues [Abstract]
Total revenues	$ 1,400,000		$ 1,300,000