Condensed Consolidated Balance Sheets (unaudited) - USD ($)		Mar. 31, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	[1]	$ 12,558,901		$ 7,333,810
Short term investments		48,751,206	[1]	51,973,971
Accounts receivable		19,165,670	[1]	4,655,105
Deferred royalty buy-down		1,648,319	[1]	1,794,126
Prepaid expenses and other current assets		580,920	[1]	623,503
Total current assets		82,705,016	[1]	66,380,515
Long-term investments		2,840,191	[1]	5,745,974
Deferred royalty buy-down - long term, net		0	[1]	732,206
Deferred tax assets, net		403,944	[1]	1,739,706
Patent costs, net		425,785	[1]	397,993
Total assets		86,374,936	[1]	74,996,394
Current liabilities:
Accounts payable and accrued expenses		1,781,163	[1]	933,998
Income tax payable		2,535,676	[1]	68,733
Deferred revenue		117,635	[1]	1,057,979
Accrued liabilities of discontinued operations		78,138	[1]	78,138
Total current liabilities		4,512,612	[1]	2,138,848
Long-term deferred revenue		17,635	[1]	5,340,708
Stockholders' equity:
Series A Preferred stock, $.50 par value, 700,000 shares authorized; none outstanding		0	[1]	0
Common stock, $.001 par value; 10,000,000 shares authorized; 7,610,167 and 7,600,167 shares issued, 7,199,233 and 7,189,233 shares outstanding as of March 31, 2018 and December 31, 2017, respectively		7,610	[1]	7,600
Additional paid-in capital		33,633,225	[1]	33,468,323
Retained earnings		56,102,054	[1]	41,939,115
Treasury stock, 410,934 shares at cost as of each period ended March 31, 2018 and December 31, 2017		(7,898,200)	[1]	(7,898,200)
Total stockholders' equity		81,844,689	[1]	67,516,838
Total liabilities and stockholders' equity		$ 86,374,936	[1]	$ 74,996,394

[1] As of January 1, 2018, the Company adopted the requirements of ASC 606 using the modified retrospective adoption method, and as a result, there is a lack of comparability of certain amounts to the prior periods presented. See Note 2 for additional discussion.