Note 12 - Stock Warrants (Details Textual) - $ / shares	Mar. 03, 2022	Sep. 30, 2022
Class of Warrant or Right, Outstanding (in shares)		23,582,230
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.20
Warrants and Rights Outstanding, Term (Year)		8 months 12 days
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 49.80
Warrants and Rights Outstanding, Term (Year)		12 years 10 months 24 days
Weighted Average [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.53
Series NN Warrants [Member]
Class of Warrant or Right, Expired in Period (in shares)	550,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 30.00
Series PP Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.50
Class of Warrant or Right, Outstanding (in shares)		23,159,906
Warrants and Rights Outstanding, Term (Year)		5 years