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Note 8 - Note Receivable (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2022

  

2021

 
         

Accounts receivable - current

 $2,131,821  $1,234,411 

Loss on foreign currency

  (50,000

)

  (50,000

)

Allowance for doubtful account

  (273,785

)

  (213,785

)

Accounts receivable, net of allowances for doubtful accounts

 $1,808,036  $970,626 
Notes Receivable [Member]  
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2022

  

2021

 
         

Note receivable

 $295,000  $295,000 

Repayment of note

  (9,000

)

  - 

Allowance for doubtful account

  (140,000

)

  (100,000

)

Note receivable, net of allowance

  146,000   195,000 

Current portion, net of allowance

 $-  $82,000 

Noncurrent portion, net of allowance

 $146,000  $113,000