Note 17 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ / shares in Units, $ in Millions	Jul. 27, 2023 USD ($) $ / shares shares
Warrants Issued in Registered Direct Offering [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.42
Warrants and Rights Outstanding, Term (Year)	5 years
Common Stock Issued in Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	23,809,524
Equity Offering, Combined Price Per Share (in dollars per share) | $ / shares	$ 0.42
Proceeds from Issuance or Sale of Equity | $	$ 10.0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $	$ 0.9