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Note 10 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Impaired Intangible Assets [Table Text Block]

Carrying amount at December 31, 2019

 $5,545 

Acquisition of Emerald Medical Services

  6,400 

Additional self-fitting software costs

  296 

Amortization of intangible assets

  (1,456)

Carrying amount at December 31, 2020

 $10,785 

Technology access costs

  221 

Amortization of intangible assets

  (2,007)

Carrying amount at December 31, 2021

 $8,999 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

December 31, 2021

 
  

Gross Carrying Amount

  

Accumulated Amortization

  

Net Carrying Amount

 

Customer list

 $6,400  $(1,267) $5,133 

Technology intangibles

  6,946   (3,080)  3,866 

Total

 $13,346  $(4,347) $8,999 
  

December 31, 2020

 
  

Gross Carrying Amount

  

Accumulated Amortization

  

Net Carrying Amount

 

Customer list

 $6,400  $(467) $5,933 

Technology intangibles

  6,725   (1,873)  4,852 

Total

 $13,125  $(2,340) $10,785