Condensed Consolidated Balance Sheets (unaudited) - USD ($)		Jun. 30, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	[1]	$ 12,960,475		$ 7,333,810
Short term investments		53,585,924	[1]	51,973,971
Accounts receivable		12,893,893	[1]	4,655,105
Deferred royalty buy-down		1,124,990	[1]	1,794,126
Prepaid expenses and other current assets		836,979	[1]	623,503
Total current assets		81,402,261	[1]	66,380,515
Long-term investments		7,163,483	[1]	5,745,974
Deferred royalty buy-down - long term, net		0	[1]	732,206
Deferred tax assets, net		321,603	[1]	1,739,706
Patent costs, net		442,968	[1]	397,993
Total assets		89,330,315	[1]	74,996,394
Current liabilities:
Accounts payable and accrued expenses		1,591,707	[1]	933,998
Income tax payable		801,800	[1]	68,733
Deferred revenue		0	[1]	1,057,979
Accrued liabilities of discontinued operations		0	[1]	78,138
Total current liabilities		2,393,507	[1]	2,138,848
Long-term deferred revenue		0	[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; 7,655,167 and 7,600,167 shares issued, 7,244,233 and 7,189,233 shares outstanding as of June 30, 2018 and December 31, 2017, respectively		7,655	[1]	7,600
Additional paid-in capital		34,424,632	[1]	33,468,323
Retained earnings		60,402,721	[1]	41,939,115
Treasury stock, 410,934 shares at cost as of June 30, 2018 and December 31, 2017		(7,898,200)	[1]	(7,898,200)
Total stockholders' equity		86,936,808	[1]	67,516,838
Total liabilities and stockholders' equity		$ 89,330,315	[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.