Note 10 - Related Party Transactions - Convertible Debt (Details) - USD ($)		1 Months Ended
	Jul. 15, 2021	Mar. 31, 2019
Conversion 2019 Notes To Common Stock [Member] | AMB Investments LLC [Member]
Principal Amount		$ 575,000
Number of shares of common stock issued (in shares)		338,235
Conversion 2019 Notes To Common Stock [Member] | Jeanne Pratt [Member]
Principal Amount	$ 100,000	$ 250,000
Number of shares of common stock issued (in shares)	50,000	147,059
Conversion 2019 Notes To Common Stock [Member] | Samuel W. Funchess [Member]
Principal Amount		$ 100,000
Number of shares of common stock issued (in shares)		58,824
Conversion 2019 Notes To Common Stock [Member] | William H. Pratt [Member]
Principal Amount	$ 100,000	$ 50,000
Number of shares of common stock issued (in shares)	50,000	29,412
Conversion of Convertible Promissory Note To Common Stock [Member] | William J. Pratt [Member]
Principal Amount	$ 100,000
Number of shares of common stock issued (in shares)	50,000