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Note 7 - Long-term Debt (Details Textual)
12 Months Ended
Apr. 21, 2020
USD ($)
Nov. 30, 2017
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Long-term Debt, Total     $ 1,765,508  
Payments to Acquire Property, Plant, and Equipment, Total     235,595 $ 1,577,175
Proceeds from Issuance of Long-term Debt, Total       2,415,970
Gain (Loss) on Extinguishment of Debt, Total     $ 2,443,418  
HSBC Bank Mortgage Loan [Member]        
Debt Instrument, Number of Payments     120  
Debt Instrument, Periodic Payment, Total     $ 25,000 25,000
Long-term Debt, Total     $ 1,800,000 $ 2,100,000
Debt Instrument, Interest Rate, Stated Percentage     1.86% 1.89%
Debt Instrument, Face Amount     $ 6,000,000 $ 6,000,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate     1.75%  
Debt Instrument, Interest Rate, Stated Percentage     1.75% 1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
Debt Instrument, Interest Rate, Stated Percentage     0.50% 0.50%
HSBC Bank Second Mortgage Loan [Member]        
Debt Instrument, Number of Payments     60  
Debt Instrument, Periodic Payment, Total     $ 62,481  
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    
Paycheck Protection Program CARES Act [Member]        
Debt Instrument, Interest Rate, Stated Percentage       1.00%
Debt Instrument, Face Amount       $ 2,415,970
Proceeds from Issuance of Long-term Debt, Total $ 2,415,970      
Gain (Loss) on Extinguishment of Debt, Total     $ 2,443,418