Note 6 - Loan Payable (Details Textual) | Mar. 26, 2020USD ($)a | Feb. 27, 2020 | Dec. 31, 2019USD ($) | Sep. 30, 2019USD ($) | Mar. 29, 2019USD ($) | Jan. 24, 2019USD ($) | Mar. 21, 2018USD ($) | Mar. 31, 2020USD ($)ft²a |
National Mortgage Banking Firm [Member] | | | | | | | | |
Debt Instrument, Origination Fee, Percentage | | 1.00% | | | | | | |
Cortlandt Manor Medical Center [Member] | | | | | | | | |
Area of Real Estate Property (Square Foot) | ft² | | | | | | | | 34,000 |
Real Estate Securing Mortgage Loan [Member] | Flowerfield Industrial Park [Member] | | | | | | | | |
Area of Real Estate Property (Square Foot) | a | 31.8 | | | | | | | 31.8 |
Real Estate Securing Mortgage Loan [Member] | Cortlandt Manor Medical Center [Member] | | | | | | | | |
Area of Real Estate Property (Square Foot) | a | 13.8 | | | | | | | |
Non-revolving Credit Line [Member] | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | $ 3,000,000 | $ 3,000,000 | |
Debt Instrument, Interest Only Phase, Term (Month) | | | | | | | 240 days | |
Debt Instrument, Interest and Principal Phase, Term (Month) | | | | | | 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 | | | | | | 3.50% | | |
Debt Instrument, Amortization Period (Year) | | | | | | 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 (Month) | | | | | | 2 years | | |
Debt Instrument, Interest and Principal Phase, Term (Month) | | | | | | 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 | | | | | | 3.50% | | |
Debt Instrument, Amortization Period (Year) | | | | | | 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] | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,500,000 | | | | | | | |
Debt Instrument, Interest Only Phase, Term (Month) | 2 years | | | | | | | |
Non-revolving Credit Line 3 [Member] | Interest Only Period of Payments [Member] | Minimum [Member] | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | 4.75% | | | | | | | |
Non-revolving Credit Line 3 [Member] | Prime Rate [Member] | Interest Only Period of Payments [Member] | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.00% | | | | | | | |