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	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues [Abstract]
Total revenues									$ 32,961,443	$ 27,443,752	$ 26,250,955
Costs and expenses [Abstract]
General and administrative	$ 2,500,000								8,805,989	8,542,324	7,896,616
Provision for income taxes	1,500,000								4,744,008	7,037,527	6,002,765
Net income	6,183,684	$ 5,043,050	$ 4,847,931	$ 3,978,604	$ 2,644,590	$ 2,714,832	$ 2,624,091	$ 3,344,753	20,053,269	11,328,266	11,372,239
Royalties [Member]
Revenues [Abstract]
Total revenues	9,900,000								32,921,764	27,426,117	25,431,012
Licensing Revenues [Member]
Revenues [Abstract]
Total revenues									39,679	$ 17,635	$ 819,943
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