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Note 18 - Subsequent Events (Details Textual) | Mar. 20, 2021 USD ($) | Dec. 07, 2019 USD ($) a | Aug. 27, 2019 USD ($) a | Jul. 16, 2020 USD ($)
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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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