Note R - Subsequent Events (Details Textual)	1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2021 USD ($)	Jul. 31, 2019	Mar. 29, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 02, 2021	Mar. 01, 2021	Dec. 31, 2018 $ / shares
Stock Issued During Period Shares, Warrants Exercised (in shares) | shares					675,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 1.97	$ 0.50			$ 2.55
Proceeds from Warrant Exercises				$ 1,018,023	$ 337,500
Purchase Commitment for Devices [Member]
Purchase Commitment Number Of Units		1,400
Purchase Commitment, Remaining Minimum Amount Committed				$ 147,224
Subsequent Event [Member] | Interim Chief Executive Officer [Member]
Royalty on Net Sales, Percentage						2.50%
Subsequent Event [Member] | Director of Clinical Affairs [Member]
Royalty on Net Sales, Percentage						2.50%	5.00%
Subsequent Event [Member] | Interim Chief Executive Officer and the Director of Clinical Affairs [Member]
Royalty on Net Sales, Percentage						5.00%
Subsequent Event [Member] | Purchase Commitment for Devices [Member]
Purchase Commitment Number Of Units	2,000
Purchase Commitment, Remaining Minimum Amount Committed	$ 1,518,364
Warrants with 0.50 Exercise Price [Member] | Subsequent Event [Member]
Stock Issued During Period Shares, Warrants Exercised (in shares) | shares			147,625
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 0.50
Proceeds from Warrant Exercises			$ 73,813
Warrants with 1.20 Exercise Price [Member] | Subsequent Event [Member]
Stock Issued During Period Shares, Warrants Exercised (in shares) | shares			1,190,700
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 1.20
Proceeds from Warrant Exercises			$ 1,428,840
Warrants with 2.60 Exercise Price [Member] | Subsequent Event [Member]
Stock Issued During Period Shares, Warrants Exercised (in shares) | shares			580,601
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares			$ 2.60
Proceeds from Warrant Exercises			$ 1,509,563