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Note 5 - Prepaid Expenses and Other Current Assets (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   

June 30,

   

December 31,

 
   

2022

   

2021

 

Prepaid inventory

  $ 218     $ 367  

Prepaid insurance

    142       138  

Prepaid dues and subscriptions

    70       18  

Prepaid marketing costs

    23        

Prepaid patents

    11       9  

Prepaid consultants

    8       68  

Prepaid sales rebates

    6       19  

Prepaid rent

          14  

Other

    151       145  

Total prepaid expenses and other current assets

  $ 629     $ 778