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Note 7 - Long-term Debt (Details Textual)
3 Months Ended
Nov. 30, 2017
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Payments to Acquire Property, Plant, and Equipment, Total   $ 422,435 $ 438,858  
Rental Income, Nonoperating   $ 111,000 $ 0  
HSBC Bank Mortgage Loan [Member]        
Debt Instrument, Number of Payments   120    
Debt Instrument, Periodic Payment, Total   $ 25,000    
Long-term Debt, Total   $ 2,300,000   $ 2,400,000
Debt Instrument, Interest Rate, Stated Percentage   2.45%   3.49%
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.75%    
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.50%    
HSBC Bank Second Mortgage Loan [Member]        
Debt Instrument, Number of Payments   60    
Debt Instrument, Periodic Payment, Total   $ 62,481    
Long-term Debt, Total   $ 9,600,000   $ 9,700,000
Debt Instrument, Interest Rate, Stated Percentage       3.9148%
Debt Instrument, Face Amount $ 10,387,500      
HSBC Bank Second Mortgage Loan [Member] | Premises at 555 North Research Place, Central Islip, NY [Member]        
Payments to Acquire Property, Plant, and Equipment, Total $ 13,850,000