Consolidated Balance Sheets - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,873,726	$ 4,999,183
Short term investments	83,844,739	84,239,918
Accounts receivable	13,593,641	19,065,919
Prepaid expenses and other current assets	1,757,250	966,456
Total current assets	102,069,356	109,271,476
Long-term investments	34,321,898	16,569,024
Property and equipment, net	61,366
Operating lease right-of-use asset	181,783	239,491
Patent costs, net	511,345	573,277
Other assets	124,348
Total assets	137,270,096	126,653,268
Current liabilities:
Accounts payable and accrued expenses	1,461,380	998,409
Income tax payable		354,984
Current portion of lease obligation	79,770	69,099
Total current liabilities	1,541,150	1,422,492
Lease obligation	106,500	167,014
Deferred tax liability, net	307,457	572,660
Total Liabilities	1,955,107	2,162,166
Commitments and contingencies (Note 10)
Stockholders' equity:
Series A Preferred stock, $.50 par value, 700,000 shares authorized; none outstanding
Common stock, $0.001 par value; 15,000,000 shares authorized; 7,826,180 and 7,813,230 shares issued, 7,344,955 and 7,339,578 shares outstanding as of September 30, 2020 and December 31, 2019, respectively	7,826	7,813
Additional paid-in capital	40,591,223	39,355,797
Retained earnings	106,647,736	96,646,527
Treasury stock, 481,225 and 473,652 shares at cost as of September 30, 2020 and December 31, 2019, respectively	(11,931,796)	(11,519,035)
Total stockholders' equity	135,314,989	124,491,102
Total liabilities and stockholders' equity	$ 137,270,096	$ 126,653,268