Note 6 - Stockholders' Equity, Stock Options and Warrants (Details Textual)			3 Months Ended		6 Months Ended
	Apr. 19, 2023 shares	Mar. 16, 2023 $ / shares shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Dec. 31, 2022 shares
Preferred Stock, Shares Authorized (in shares)			20,000,000		20,000,000		20,000,000
Common Stock, Shares Authorized (in shares)	200,000,000		200,000,000		200,000,000		200,000,000
Share-Based Payment Arrangement, Expense | $			$ 5,872	$ 39,383	$ 15,159	$ 75,901
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $			3,964		$ 3,964
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)					21 months
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $			$ 11,818		$ 11,818
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)					7 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)			2,500		2,500
Minimum [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					3 years
Maximum [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					10 years
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	20
Reverse Stock Split [Member] | Minimum [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Reverse Stock Split [Member] | Maximum [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	25
Series F Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)		80,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.01
Preferred Stock Dividends, Shares Per Share (in shares)		0.001
Preferred Stock, Shares Issued (in shares)		79,404
Preferred Stock, Voting Rights Per Share (in dollars per share) | $ / shares		$ 1,000,000
Preferred Stock, Shares Outstanding (in shares)	0
Dividends Payable, Date of Record		Mar. 27, 2023