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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash		$ 8,000		$ 48,900
Cash and Cash Equivalents, at Carrying Value		8,291		$ 64,168
Proceeds from Warrant Exercises		6,294	$ 0
Second Amendment to 2020 KWH Loan [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 10,000
Forecast [Member]
Proceeds from Warrant Exercises	$ 16,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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