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Note 18 - Subsequent Events (Details Textual)	Mar. 20, 2021 USD ($)	Dec. 07, 2019 USD ($) a	Aug. 27, 2019 USD ($) a	Jul. 16, 2020 USD ($)
Non-revolving Credit Line 3 [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 2,500,000
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,000,000
Debt Instrument, Interest and Principal Phase, Term (Month)	7 years
Cortlandt Manor Property In New York [Member]
Area of Land (Acre) | a		4.5
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 5,720,000
Flowerfield Complex in Smithtown, New York [Member]
Area of Land (Acre) | a			9
Flowerfield Complex in Smithtown, New York [Member] | BSL St. James LLC [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 16,800,000

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The debt instrument term for the phase of interest and principal payments.

+ References

No definition available.

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Area of land held.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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