Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 8,100,288	$ 12,484,256
Investment in debt securities	7,389,407	2,892,190
Accounts receivable, net	14,011,180	13,145,934
Inventories	2,997,120	1,628,817
Prepaid and other current assets	1,505,175	1,750,994
Total Current Assets	34,003,170	31,902,191
Property and Equipment, Net	1,082,428	891,029
Patent Rights, Net	337,351	433,737
Deposits	101,561	24,272
Operating Lease Right-of-Use Assets, Net	1,400,037
Total Assets	36,924,547	33,251,229
Current Liabilities
Accounts payable and accrued expenses	4,779,435	5,166,239
Deferred revenue, current portion	1,191,898	722,025
Operating lease liabilities, current portion	309,524
Product warranties	187,454	136,217
Total Current Liabilities	6,468,311	6,024,481
Operating Lease Liabilities	1,115,529
Deferred Revenue, Net of Current Portion	1,339,285	766,732
Total Liabilities	8,923,125	6,791,213
Stockholders' Equity
Preferred stock, 5,000,000 shares authorized and none issued and outstanding
Common stock, $0.01 par value - 50,000,000 authorized; 16,540,478 issued and 16,485,780 outstanding at December 31, 2019; 16,145,915 issued and 16,112,461 outstanding at December 31, 2018	165,404	161,459
Additional paid-in capital	43,314,123	39,957,905
Treasury stock, 54,698 and 33,454 shares at cost, at December 31, 2019 and 2018, respectively	(252,570)	(133,816)
Accumulated deficit	(15,225,535)	(13,525,532)
Total Stockholders' Equity	28,001,422	26,460,016
Total Liabilities and Stockholders' Equity	$ 36,924,547	$ 33,251,229