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Note 7 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt as of December 31 consists of the following:
                
   
2020
    
2019
  
HSBC $10,387,500 Mortgage payable secured by real property Buildings and improvements at 555 N Research Drive, Central Islip, NY payable in monthly principal installments of $62,481 including Interest at a rate of 3.9148% maturing on December 1, 2022.
   $
9,315,246
     $
9,686,211
  
                 
PPP Loan $2,415,970, maturing on April 21, 2022, with interest accruing at 1% per annum
    
2,415,970
      
-
  
                 
HSBC $6,000,000 Mortgage payable secured by building Buildings and improvements at 355 South Technology Drive, Central Islip, NY payable in monthly principal installments of $25,000 plus interest. Interest presently accrues at our option, at the variable rate of LIBOR plus 1.75% or HSBC's Prime rate minus 0.50% The loan matures on March 1, 2022.
    
2,065,508
      
2,365,508
  
Total long-term debt
   $
13,796,724
     $
12,051,719
  
Less: Current maturities
    
(690,667
 )    
(674,593
 )
Long-term debt
   $
13,106,057
     $
11,377,126
  
Schedule of Maturities of Long-term Debt [Table Text Block]
2021
   $
690,667
  
2022
    
13,106,057
  
         
Total long-term debt
   $
13,796,724