Consolidated Balance Sheets (unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 8,934,794	$ 5,624,860
Short-term investments	7,973,002	6,966,964
Accounts receivable, net	1,921,810	5,004,418
Income tax receivable	293,976	255,708
Deferred tax assets	97,537	94,992
Prepaid expenses and other current assets	327,947	326,519
Total current assets	19,549,066	18,273,461
Deferred royalty buy-down	3,350,000	3,350,000
Deferred tax assets - long term	1,405,219	1,412,784
Patent costs, net	322,607	215,999
Total assets	24,626,892	23,252,244
Current liabilities:
Accounts payable and accrued expenses	877,084	634,277
Deferred revenue	69,130	69,130
Accrued liabilities of discontinued operations	78,138	78,138
Total current liabilities	1,024,352	781,545
Long-term deferred revenue	120,978	138,260
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 ; 6,706,167 and 6,655,168 shares issued at March 31, 2014 and December 31, 2013, respectively	6,706	6,655
Additional paid-in capital	21,427,849	20,951,796
Retained earnings	5,729,008	4,975,018
Treasury stock, 303,964 and 300,739 shares at cost at March 31, 2014 and December 31, 2013, respectively	(3,682,001)	(3,601,030)
Total stockholders' equity	23,481,562	22,332,439
Total liabilities and stockholders' equity	$ 24,626,892	$ 23,252,244