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Note 2 - Long-term Debt (Details Textual) - USD ($) $ / shares in Units, $ in Thousands								3 Months Ended	9 Months Ended		12 Months Ended
	Jul. 02, 2021	Jul. 01, 2021	Jun. 29, 2021	May 18, 2021	May 10, 2021	Mar. 24, 2020	Mar. 23, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 24, 2021	Mar. 23, 2021
Fair Value Adjustment of Warrants									$ (573)	$ (259)
Debt Instrument, Extension Option Fee Percentage				1.00%
Preferred Stock, Dividend Rate, Percentage									8.857%	8.857%
Deposits, Segregated Account, Pre-fund Eight Quarterly Dividend Payments	$ 10,200
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	8.875%	8.875%	8.875%					8.875%	8.875%		8.875%
Preferred Stock, Liquidation Preference Per Share (in dollars per share)			$ 25,000.00
Depository Shares [Member]
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 25.00	$ 25.00	$ 25.00
New Loan [Member]
Debt Instrument, Face Amount	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Debt Instrument, Unamortized Discount, Total	$ 2,900
New Loan [Member] \| Repayment Prior to Six-months of the Closing Date [Member]
Debt Instrument, Repayment Fee Percentage	0.00%
New Loan [Member] \| Repayment After Six-months of the Closing Date [Member]
Debt Instrument, Repayment Fee Percentage	2.00%
New Loan [Member] \| Repayment After Eighteen-months of the Closing Date [Member]
Debt Instrument, Repayment Fee Percentage	4.00%
New Loan [Member] \| Repayment After Thirty-months of the Closing Date [Member]
Debt Instrument, Repayment Fee Percentage	6.00%
New Loan [Member] \| Issuance Within Six-months of the Closing Date [Member]
Debt Instrument, Prepay Amount, Percentage of the Cash Proceeds Received	25.00%
New Loan [Member] \| Issuance After Six-months and Before Ony Year of the Closing Date [Member]
Debt Instrument, Prepay Amount, Percentage of the Cash Proceeds Received	50.00%
New Loan [Member] \| Issuance After One Year of the Closing Date [Member]
Debt Instrument, Prepay Amount, Percentage of the Cash Proceeds Received	75.00%
New Loan [Member] \| Before 12-months Anniversary of the Closing of the Debt [Member]
Debt Instrument, Percentage of Principal Exchanged into Depositary Receipts	25.00%
New Loan [Member] \| Between 12-months and 18-months Anniversary of the Closing of the Debt [Member]
Debt Instrument, Percentage of Principal Exchanged into Depositary Receipts	50.00%
New Loan [Member] \| Between 18-months and 24-months Anniversary of the Closing of the Debt [Member]
Debt Instrument, Percentage of Principal Exchanged into Depositary Receipts	75.00%
New Loan [Member] \| After 24-months Anniversary of the Closing of the Debt [Member]
Debt Instrument, Percentage of Principal Exchanged into Depositary Receipts	100.00%
Affiliate of BRS [Member] \| Senior Secured Debt Issued By Cadiz [Member]
Payments to Acquire Notes Receivable	$ 77,500
Lenders [Member]
Stock Issued During Period, Shares, Payment of Debt Extension Fees (in shares)				64,356
Apollo [Member]
Stock Issued During Period, Shares Debt Reassignment Fee (in shares)	299,210
Additional Paid-in Capital [Member] \| Reclassification of Debt Issuance Costs to Additional Paid In Capital [Member]
Current Period Reclassification Adjustment						$ 1,900	$ 1,300
2017 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						362,500						362,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 0.01	$ 0.01	$ 6.75					$ 0.01	$ 6.75
Class of Warrant or Right, Exercised During Period (in shares)					362,500
Stock Issued During Period, Shares, Exercise of Warrants (in shares)					362,500
Warrants Issued to Lenders [Member]
Class of Warrant or Right, Issued During Period (in shares)	2
Warrants and Rights Outstanding								$ 1,900	$ 1,900
A Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 17.38
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	500,000
Percentage of Closing Price Per Share of Common Stock	120.00%
B Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 21.72
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	500,000
Percentage of Closing Price Per Share of Common Stock	150.00%
Warrants and Rights Outstanding, Term (Year)	180 years