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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%