Note 1 - Organization and Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		4 Months Ended	12 Months Ended
	Oct. 29, 2021	Mar. 31, 2023	Mar. 31, 2022	Oct. 28, 2021	Dec. 31, 2022	Aug. 30, 2022
Stock Issued During Period, Shares, New Issues (in shares)		2,690,000,000			3,885,048,000
Stock Issued During Period, Value, New Issues		$ 31,657			$ 40,580
Proceeds from Issuance of Common Stock		31,657	$ 0
Direct Operating Costs		$ 165	$ 325
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01			$ 0.01	$ 0.01
June 2021 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Number of Shares Issuable (in shares)				250,000,000
October 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	9,742,188
Stock Issued During Period, Value, New Issues	$ 151,800
Proceeds from Issuance of Common Stock	$ 149,300
March 2023 Equity Distribution Agreement [Member]
Equity Agreement, Maximum Number of Shares Issuable (in shares)		250,000,000
Stock Issued During Period, Shares, New Issues (in shares)		0