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Note 7 - Long-term Debt (Details Textual)					3 Months Ended	9 Months Ended
	Oct. 31, 2019 USD ($)	Oct. 30, 2019 USD ($)	Jul. 01, 2019 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total						$ 2,115,733	$ 2,258,379
Rental Income, Nonoperating					$ 207,000	$ 207,000
Monthly Rental Income			$ 67,000
Annual Rental Income			$ 800,000
Eastside [Member] | Subsequent Event [Member]
Terminated Monthly Rental Income	$ 31,667	$ 31,667
Terminated Annual Rent Income	$ 380,000	$ 380,000
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Number of Payments						120
Debt Instrument, Periodic Payment, Total						$ 25,000
Long-term Debt, Total					$ 2,400,000	$ 2,400,000		$ 2,700,000
Debt Instrument, Interest Rate, Stated Percentage					3.95%	3.95%		2.18%
Rental Income, Nonoperating					$ 36,000
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					$ 9,800,000	$ 9,800,000		$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage					3.9148%	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

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