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Note 5 - Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
  

December 31,

  

December 31,

 
  

2021

  

2020

 
Prepaid inventory $368  $ 

Prepaid insurance

  138   165 
Prepaid consulting services  68    

Prepaid sales rebates

  19   144 

Prepaid security deposit for lease

     65 

Prepaid dues and subscription

  18   53 
Prepaid rent  14    

Prepaid patents

  9   47 

Other

  144   102 

Total prepaid expenses and other current assets

 $778  $576