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Note 7 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
2021
    
2,773,000
  
Less: Unamortized debt issuance costs
    
85,000
  
Less: Current portion
    
2,688,000
  
Long-term portion
   $
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