CONDENSED BALANCE SHEETS - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 58,371,572	$ 50,068,728
Investments	945,066	1,909,368
Accounts receivable, net of allowance for doubtful accounts of $45,891 as of September 30, 2021 and $46,484 as of December 31, 2020	4,253,647	4,574,932
Inventory, net	4,433,389	3,933,987
Prepaid expenses and other current assets	685,449	771,666
Prepaid income taxes	2,899,939	2,477,211
Total current assets	71,589,062	63,735,892
Property and equipment, net	2,110,377	2,120,148
Intangible assets, net	1,054,641	960,885
Operating lease right-of-use asset, net	2,548,702	2,715,030
Deferred income taxes, net	870,028	1,272,672
Other assets	225,749	261,993
Total assets	78,398,559	71,066,620
Current liabilities:
Accounts payable	842,660	657,054
Accrued payroll and benefits	2,413,986	1,714,782
Other accrued taxes	91,254	103,981
Warranty reserve	111,007	90,054
Deferred revenue	2,442,430	1,949,259
Current portion of operating lease liability	272,498	255,698
Other current liabilities	146,435	146,435
Total current liabilities	6,320,270	4,917,263
Deferred revenue	1,910,668	2,305,413
Operating lease liability, less current portion	2,276,204	2,459,332
Total liabilities	10,507,142	9,682,008
Stockholders' equity:
Common stock; $0.0001 par value; 31,500,000 shares authorized; 12,340,654 shares issued and outstanding as of September 30, 2021 and 12,308,432 shares issued and outstanding as of December 31, 2020	1,234	1,231
Additional paid-in capital	24,766,697	23,676,843
Retained earnings	43,102,255	37,669,451
Accumulated other comprehensive income	21,231	37,087
Total stockholders' equity	67,891,417	61,384,612
Total liabilities and stockholders' equity	$ 78,398,559	$ 71,066,620