Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (2,913,291)	$ (3,687,178)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	281,928	279,043
Amortization	22,884	56,249
Amortization of discount on investments	0	(1,189)
Amortization of right-of-use assets	193,290	216,518
Share-based compensation expense	130,536	158,304
Loan and accrued interest forgiveness on note payable	(821,515)	0
Changes in operating assets and liabilities:
Accounts receivable	(33,047)	(19,292)
Inventory	(15,501)	(10,931)
Other assets	329,461	172,504
Accounts payable	165,789	(117,540)
Accrued expenses and other	(1,017,803)	362,775
Lease liabilities	(210,045)	(225,678)
Other liabilities	5,933	13,432
Net cash used in operating activities	(3,881,381)	(2,802,983)
Cash flows from investing activities:
Maturities of short-term investments	0	1,000,000
Purchases of property and equipment	(12,512)	(5,050)
Payments for patents and other intangible assets	0	(22,976)
Net cash (used in) provided by investing activities	(12,512)	971,974
Cash flows from financing activities:
Proceeds from issuance of common stock	31,725,645	52,800
Payments of offering costs	(1,243,960)	0
Proceeds from note payable and advance	0	822,500
Repayment of note payable	(40,980)	0
Payments under lease obligations	(10,170)	(9,201)
Net cash provided by financing activities	30,430,535	866,099
Net change in cash and cash equivalents	26,536,642	(964,910)
Cash and cash equivalents:
Beginning of year	3,322,226	6,415,274
End of year	29,858,868	5,450,364
Cash paid for:
Interest	4,130	3,975
Income taxes	800	2,000
Non-cash investing and financing activities:
Prepaid insurance financed with promissory notes	470,556	0
Offering costs included in accounts payable and accrued expenses	334,683	0
Conversion of convertible preferred stock to common stock	$ 55,360,897	$ 0