Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 16,871,522	$ 4,999,183
Short term investments	82,180,784	84,239,918
Accounts receivable	11,696,598	19,065,919
Prepaid expenses and other current assets	1,310,388	966,456
Total current assets	112,059,292	109,271,476
Long-term investments	20,791,278	16,569,024
Property and equipment, net	64,839	0
Operating lease right-of-use asset	201,228	239,491
Patent costs, net	531,989	573,277
Other assets	133,159	0
Total assets	133,781,785	126,653,268
Current liabilities:
Accounts payable and accrued expenses	2,090,056	998,409
Income tax payable	1,673,051	354,984
Current portion of lease obligation	78,560	69,099
Total current liabilities	3,841,667	1,422,492
Lease obligation	126,822	167,014
Deferred tax liability, net	395,858	572,660
Total liabilities	4,364,347	2,162,166
Commitments and Contingencies
Stockholders' equity:
Preferred stock, $0.50 par value, 700,000 shares authorized (150,000 shares designated as Series A Convertible Redeemable Preferred Stock and 10,000 shares designated as Series C Junior Participating Preferred Stock); none outstanding
Common stock, $.001 par value; 10,000,000 shares authorized; 7,815,230 and 7,813,230 shares issued, 7,337,511 and 7,339,578 shares outstanding as of March 31, 2020 and December 31, 2019, respectively	7,826	7,813
Additional paid-in capital	40,080,279	39,355,797
Retained earnings	101,261,129	96,646,527
Treasury stock, 477,720 and 473,653 shares at cost as of March 31, 2020 and December 31, 2019, respectively	(11,931,796)	(11,519,035)
Total stockholders' equity	129,417,438	124,491,102
Total liabilities and stockholders' equity	$ 133,781,785	$ 126,653,268