Note A - Organization and Business (Details Textual)		1 Months Ended					12 Months Ended
	Jun. 30, 2020 shares	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($) shares	Mar. 31, 2019 USD ($) shares	Feb. 28, 2019 USD ($) shares	May 31, 2014 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of Countries in which Entity Operates							60
Proceeds from Stock Options Exercised | $							$ 384,146
Proceeds from Issuance of Private Placement | $					$ 250,000	$ 10,000,000		250,000
Proceeds from Issuance of Common Stock | $							$ 18,043,284	$ 1,974,547
Warrants, Public Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares					1,428,750
Underwrite Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				141,850	141,850
Warrants, Private Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares					178,571
Public Offering [Member]
Proceeds from Issuance or Sale of Equity, Total | $					$ 2,000,000
Stock Issued During Period, Shares, New Issues (in shares) | shares					5,715,000
Proceeds from Stock Options Exercised | $				$ 198,000	$ 198,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares				567,400	567,400
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares					714,286	2,000,000
Proceeds from Issuance of Common Stock | $						$ 3,000,000
April 6, 2020 Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares			5,420,000
Proceeds from Issuance of Common Stock | $			$ 4,600,000
June 30, 2020 Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	6,770,000
Proceeds from Issuance of Common Stock | $		$ 13,400,000