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Note 8 - Note Receivable (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 

Accounts receivable

 $2,817,116  $1,234,411 

Loss on foreign currency

  (50,000

)

  (50,000

)

Allowance for doubtful accounts

  (213,785

)

  (213,785

)

Accounts receivable, net of allowances for doubtful accounts

 $2,553,331  $970,626 
Notes Receivable [Member]  
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 
         

Note receivable

 $295,000  $295,000 

Repayment of note

  (3,000)  - 

Allowance for doubtful account

  (100,000

)

  (100,000)

Note receivable, net of allowance

  192,000   195,000 

Current portion, net of allowance

 $82,000  $82,000 

Noncurrent portion, net of allowance

 $110,000  $113,000