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Note 7 - Common Stock and Treasury Stock (Details Textual)
$ in Thousands
 3 Months Ended
Apr. 11, 2024
shares
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Class of Warrant or Right, Outstanding (in shares)     0
Common Stock, Shares, Outstanding (in shares)   13,660,598 13,616,341
Treasury Stock, Common, Shares (in shares)   768,595 768,595
Common Stock, Shares, Issued (in shares)   14,429,193 14,384,936
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   0  
Treasury Stock, Common, Value | $   $ 11,407 $ 11,407
Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)   44,257  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   0  
Reverse Stock Split [Member]      
Common Stock, Shares, Outstanding (in shares)   81,571,864  
Treasury Stock, Common, Shares (in shares)   4,611,569  
Reverse Stock Split [Member] | Subsequent Event [Member]      
Stockholders' Equity Note, Stock Split, Conversion Ratio 6    
Common Stock, Shares, Outstanding (in shares) 13,660,598    
Treasury Stock, Common, Shares (in shares) 768,595