Note 9 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Sep. 14, 2022	Apr. 06, 2022	Sep. 30, 2022	Sep. 30, 2021
Proceeds from Issuance of Common Stock			$ 115,000	$ 389
Stock Issued During Period, Exercise Of Warrants, Shares (in shares)			520,335
HGC NEXT INV LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)		4,618,226
Share Price (in dollars per share)		$ 6.496
Proceeds from Issuance of Common Stock		$ 30,000
The “Purchasers” [Member]
Stock Issued During Period, Shares, New Issues (in shares)	15,454,160
Share Price (in dollars per share)	$ 5.50
Proceeds from Issuance of Common Stock	$ 85,000