Note 2 - Going Concern and Management's Plan (Details Textual) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
	Dec. 01, 2023	Dec. 31, 2023	Jan. 25, 2024	Dec. 31, 2022
Retained Earnings (Accumulated Deficit)		$ (333,277)		$ (315,717)
Cash and Cash Equivalents, at Carrying Value		1,139		$ 3,941
Subsequent Event [Member] | Discontinued Operations, Disposed of by Sale [Member] | Golden Ridge Rice Mills, LLC [Member]
Disposal Group, Including Discontinued Operation, Consideration			$ 2,150
Funicular [Member]
Payments for Mortgage Deposits		$ 1,500
Entity Owned by Cable Car Capital LLC [Member]
Stock Issued During Period, Value, New Issues	$ 400
Debt Instrument, Face Amount	$ 4,100
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		5.0
Ownership Percentage, If Warrants Exercised		49.80%
Stock Issued During Period, Shares, New Issues (in shares)		0.6
Entity Owned by Cable Car Capital LLC [Member] | Existing Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2.2
Entity Owned by Cable Car Capital LLC [Member] | New Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1.2