Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 4,747,745	$ 5,137,875
Short term investments	45,075,570	28,347,542
Accounts receivable	3,846,752	2,547,920
Income tax receivable	0	916,843
Deferred royalty buy-down	1,215,620	1,017,981
Prepaid expenses and other current assets	554,401	383,810
Total current assets	55,440,088	38,351,971
Long-term investments	1,443,099	3,596,541
Deferred royalty buy-down - long term, net	1,913,697	2,851,423
Deferred tax assets, net	3,370,836	622,972
Patent costs, net	268,928	275,206
Total assets	62,436,648	45,698,113
Current liabilities:
Accounts payable and accrued expenses	991,867	611,009
Income taxes payable	279,333	0
Deferred revenue	1,223,479	149,378
Accrued liabilities of discontinued operations	78,138	78,138
Total current liabilities	2,572,817	838,525
Long-term deferred revenue	6,642,441	49,379
Stockholders' equity:
Series A Preferred stock, $.50 par value, 700,000 shares authorized; none outstanding	0	0
Common stock, $.001 par value; 10,000,000 shares authorized; 7,545,167 and 7,290,167 shares issued, 7,149,559 and 6,918,579 shares outstanding as of September 30, 2016 and December 31, 2015, respectively	7,545	7,290
Additional paid-in capital	32,650,938	31,797,418
Retained earnings	27,694,041	19,238,610
Treasury stock, 395,608 and 371,588 shares at cost as of September 30, 2016 and December 31, 2015, respectively	(7,131,134)	(6,233,109)
Total stockholders' equity	53,221,390	44,810,209
Total liabilities and stockholders' equity	$ 62,436,648	$ 45,698,113