Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 8,547,199	$ 9,810,816
Short term investments	19,245,847	10,900,436
Accounts receivable, net	3,001,975	2,938,731
Investment interest receivable	119,382	48,316
Income tax receivable	708,237	653,116
Deferred tax asset	16,907	16,907
Deferred royalty buy-down	640,587	569,641
Prepaid expenses	469,037	210,847
Total current assets	32,749,171	25,148,810
Long-term Investments	1,437,000	1,250,000
Deferred royalty buy-down - long term, net	3,001,489	3,271,120
Deferred tax assets - long term	821,236	1,061,864
Patent costs, net	289,783	295,030
Total assets	38,298,679	31,026,824
Current liabilities:
Accounts payable and accrued expenses	831,389	543,696
Deferred revenue	49,379	49,378
Accrued liabilities of discontinued operations	78,138	78,138
Total current liabilities	958,906	671,212
Long-term deferred revenue	74,068	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; 7,197,475 and 7,062,209 shares issued, 6,847,945 and 6,730,622 outstanding as of June 30, 2015 and December 31, 2014, respectively	7,197	7,062
Additional paid-in capital	28,681,190	25,059,458
Retained earnings	13,709,082	9,620,978
Treasury stock, 349,530 and 331,587 shares at cost as of June 30, 2015 and December 31, 2014, respectively	(5,131,764)	(4,430,643)
Total stockholders' equity	37,265,705	30,256,855
Total liabilities and stockholders' equity	$ 38,298,679	$ 31,026,824