Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 7,488,076	$ 9,810,816
Short term investments	23,442,395	10,900,436
Accounts receivable, net	4,211,810	2,938,731
Income tax receivable	1,174,237	653,116
Investment interest receivable	137,258	48,316
Deferred tax asset	16,907	16,907
Deferred royalty buy-down	802,094	569,641
Prepaid expenses	258,057	210,847
Total current assets	37,530,834	25,148,810
Long-term Investments	1,894,000	1,250,000
Deferred royalty buy-down - long term, net	2,618,574	3,271,120
Deferred tax assets - long term	620,653	1,061,864
Patent costs, net	285,087	295,030
Total assets	42,949,148	31,026,824
Current liabilities:
Accounts payable and accrued expenses	651,068	543,696
Deferred revenue	49,378	49,378
Accrued liabilities of discontinued operations	78,138	78,138
Total current liabilities	778,584	671,212
Long-term deferred revenue	61,723	98,757
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; 7,280,167 and 7,062,209 shares issued, 6,921,137 and 6,730,622 outstanding as of September 30, 2015 and December 31, 2014, respectively	7,280	7,062
Additional paid-in capital	31,134,211	25,059,458
Retained earnings	16,580,061	9,620,978
Treasury stock, 359,030 and 331,587 shares at cost as of September 30, 2015 and December 31, 2014, respectively	(5,612,711)	(4,430,643)
Total stockholders' equity	42,108,841	30,256,855
Total liabilities and stockholders' equity	$ 42,949,148	$ 31,026,824