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Note 6 - Loan Payable (Details Textual) | Mar. 26, 2020 USD ($) a | Feb. 27, 2020 | Feb. 21, 2020 USD ($) | Dec. 31, 2019 USD ($) ft² a | Sep. 30, 2019 USD ($) | Mar. 29, 2019 USD ($) | Feb. 21, 2019 USD ($) | Jan. 24, 2019 USD ($) | Mar. 21, 2018 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Subsequent Event [Member] | National Mortgage Banking Firm [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Origination Fee, Percentage |  | 1.00% |  |  |  |  |  |  |
Cortlandt Manor Medical Center [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  |  | 34,000 |  |  |  |  |
Real Estate Securing Mortgage Loan [Member] | Flowerfield Industrial Park [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property | a |  |  |  | 31.8 |  |  |  |  |
Real Estate Securing Mortgage Loan [Member] | Cortlandt Manor Medical Center [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property | a | 14 |  |  |  |  |  |  |  |
Non-revolving Credit Line [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 3,000,000 | $ 3,000,000 | $ 3,000,000
Debt Instrument, Interest Only Phase, Term |  |  |  |  |  |  |  |  | 240 days
Debt Instrument, Interest and Principal Phase, Term |  |  |  |  |  |  | 7 years | 7 years |
Proceeds from Lines of Credit, Total |  |  |  |  |  | $ 1,100,000 |  | $ 1,100,000 |
Non-revolving Credit Line [Member] | Interest Only Period of Payments [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 6.50% |
Non-revolving Credit Line [Member] | After Interest Only Payment Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 3.25% |
Debt Instrument, Amortization Period |  |  |  |  |  |  |  | 20 years |
Non-revolving Credit Line [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 1.00% |
Non-revolving Credit Line [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 2.00% |
Non-revolving Credit Line 2 [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 3,000,000 |
Debt Instrument, Interest Only Phase, Term |  |  |  |  |  |  |  | 2 years |
Debt Instrument, Interest and Principal Phase, Term |  |  |  |  |  |  |  | 7 years |
Proceeds from Lines of Credit, Total |  |  |  | $ 500,000 | $ 1,000,000 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 1,419,932 |  |  |  |  |
Debt Issuance Costs, Line of Credit Arrangements, Gross |  |  |  |  |  |  |  | $ 80,068 |
Non-revolving Credit Line 2 [Member] | Interest Only Period of Payments [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 6.50% |
Non-revolving Credit Line 2 [Member] | After Interest Only Payment Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 3.25% |
Debt Instrument, Amortization Period |  |  |  |  |  |  |  | 20 years |
Non-revolving Credit Line 2 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 1.00% |
Non-revolving Credit Line 2 [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 2.00% |
Non-revolving Credit Line 3 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,500,000 |  | $ 3,000,000 |  |  |  |  |  |
Debt Instrument, Interest Only Phase, Term | 2 years |  |  |  |  |  |  |  |
Debt Instrument, Interest and Principal Phase, Term |  |  | 7 years |  |  |  |  |  |
Non-revolving Credit Line 3 [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.00% |  |  |  |  |  |  |  |
Non-revolving Credit Line 3 [Member] | After Interest Only Payment Period [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.0475% |  |  |  |  |  |  |  |
Non-revolving Credit Line 3 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |  |  |  |  |  |  |  |
Non-revolving Credit Line 3 [Member] | Prime Rate [Member] | After Interest Only Payment Period [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% |  |  |  |  |  |  |  |
Non-revolving Credit Line 3 [Member] | Federal Home Loan Bank Rate [Member] | After Interest Only Payment Period [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.0475% |  |  |  |  |  |  |  |

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