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Note 8 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
2016
    
2015
  
HSBC
               
$2,100,000 5 year term loan payable in monthly installments of $35,000 plus interest on the unpaid principal balance which accrues at a fixed rate of 3.045%. This term loan was secured by $1 million, provided that, so long as no event of default occurred and is then continuing, HSBC would release $200,000 of the collateral on each anniversary of the closing date. As of December 31, 2016, this term loan had been paid in full.
  $
---
     $
280,000
  
                 
HSBC
               
$6,000,000 Mortgage payable secured by real property
Buildings and improvements at 355 South Technology Drive, Central Islip, NY payable in monthly principle 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.
    
3,265,508
      
3,565,508
  
Total long-term debt
    
3,265,508
      
3,845,508
  
Less: Current maturities
    
300,000
      
580,000
  
Long-term debt
   $
2,965,508
     $
3,265,508
  
Schedule of Maturities of Long-term Debt [Table Text Block]
2017
 
$
300,000
 
2018
 
 
300,000
 
2019
 
 
300,000
 
2020
 
 
300,000
 
2021
 
 
300,000
 
Thereafter
 
 
1,765,508
 
Total long-term debt
 
$
3,265,508