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Note 4 - Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

September 30,

  

December 31,

 
  

2023

  

2022

 

Prepaid inventory

 $93  $211 

Prepaid insurance

  73   146 

Prepaid dues and subscriptions

  65   43 

Prepaid marketing costs

  26   24 

Prepaid patents

  4   12 

Tenant allowance

     11 

Other

  72   113 

Total prepaid expenses and other current assets

 $333  $560