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Note 4 - Other Accrued Liabilities (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Other Liabilities [Table Text Block]
  

March 31,

  

December 31,

 
  

2024

  

2023

 

Professional services

 $769,000  $472,000 

Operating costs

  489,000   450,000 

Other

  326,000   304,000 

Total other accrued liabilities

 $1,584,000  $1,226,000