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Note 14 - Financial Instruments (Details Textual) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Feb. 26, 2021
Aug. 03, 2020
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Derivatives Hedging Instruments       $ 0 $ 0
Embedded Conversion Features And Term Extension Option Expense   $ 407,000      
Remaining Embedded Conversion Features And Term Extension Option Net Expense     $ 9,000    
Fair Value, Inputs, Level 2 [Member]          
Long-Term Debt, Fair Value       271,000 269,000
Forward Contracts [Member]          
Foreign Currency Contract, Asset, Fair Value Disclosure       1,000 0
Foreign Currency Contracts, Liability, Fair Value Disclosure       1,000 0
Series A Preferred Stock [Member]          
Stock Repurchased During Period, Shares (in shares) 1        
Series A Preferred Stock [Member] | Other Charges Income Net [Member]          
Revaluation Of Stock Expense $ 2,000        
Series B Preferred Stock [Member]          
Stock Issued During Period Number Of New Shares Exchanged (in shares) 1        
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Asset, Notional Amount       $ 308,000 $ 322,000