Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 03, 2023	Mar. 31, 2023	Mar. 31, 2022
Proceeds from Issuance of Common Stock		$ 35,000	$ 0
HGC NEXT INV LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)	5,835,277
Share Price (in dollars per share)	$ 5.998
Proceeds from Issuance of Common Stock	$ 35,000