Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 6,964,402	$ 5,137,875
Short term investments	36,607,289	28,347,542
Accounts receivable	4,279,440	2,547,920
Income tax receivable	884,439	916,843
Deferred royalty buy-down	1,139,341	1,017,981
Prepaid expenses and other current assets	730,756	383,810
Total current assets	50,605,667	38,351,971
Long-term investments	2,264,531	3,596,541
Deferred royalty buy-down - long term, net	2,236,671	2,851,423
Deferred tax assets	3,358,617	622,972
Patent costs, net	267,100	275,206
Total assets	58,732,586	45,698,113
Current liabilities:
Accounts payable and accrued expenses	587,441	611,009
Deferred revenue	1,065,055	149,378
Accrued liabilities of discontinued operations	78,138	78,138
Total current liabilities	1,730,634	838,525
Long-term deferred revenue	7,087,141	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; 7,405,167 and 7,290,167 shares issued, 7,014,849 and 6,918,579 shares outstanding as of June 30, 2016 and December 31, 2015, respectively	7,405	7,290
Additional paid-in capital	32,192,884	31,797,418
Retained earnings	24,640,449	19,238,610
Treasury stock, 390,318 and 371,588 shares at cost as of June 30, 2016 and December 31, 2015, respectively	(6,925,927)	(6,233,109)
Total stockholders' equity	49,914,811	44,810,209
Total liabilities and stockholders' equity	$ 58,732,586	$ 45,698,113