Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ / shares in Units, $ in Millions	Apr. 07, 2022 USD ($) $ / shares shares
Stock Issued During Period, Shares, New Issues (in shares) | shares	4,618,226
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 6.496
Proceeds from Issuance of Common Stock | $	$ 30