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Bank Debt (Details Textual)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
ft²
CreditFacilities
Mar. 31, 2016
USD ($)
CreditFacilities
Sep. 30, 2015
USD ($)
Sep. 30, 2010
USD ($)
Dec. 31, 2018
USD ($)
CreditFacilities
Dec. 31, 2017
USD ($)
Bank Debt (Textual)            
Number of credit facilities | CreditFacilities         5  
Debt issue costs         $ 1,971 $ 66,101
Unrestricted cash, cash equivalents and short-term investments         $ 2,000,000  
Credit Facilities [Member]            
Bank Debt (Textual)            
Number of credit facilities | CreditFacilities 2 2        
Credit facility aggregate value $ 6,500,000 $ 4,500,000        
Variable interest rate with LIBOR, description         These notes bear interest at a variable rate equal to the one-month LIBOR plus a margin of 2.25%.  
Variable interest rate         4.60%  
Debt issue costs 68,072 $ 46,734 $ 34,125 $ 26,489    
Outstanding under line of credit         $ 500,000  
Credit Facilities One [Member]            
Bank Debt (Textual)            
Variable interest rate with LIBOR, description         This note bears interest at a variable rate equal to the one-month LIBOR plus a margin of 2.25%.  
Variable interest rate         4.55%  
Interest rate swaps [Member]            
Bank Debt (Textual)            
Variable interest rate with LIBOR, description         Interest rate exposures on Loan #1 and Loan #2 with interest rate swap agreements that effectively converted floating interest rates based on the one-month LIBOR plus a margin of 3.25% and 2.25% to the fixed rates of 6.04% and 4.38%, respectively. As of December 31, 2018, the variable rates on these two mortgage notes were 5.68% and 4.73%, respectively.  
Original notional amount         $ 2,796,372  
Interest rate swaps [Member] | Loan One [Member]            
Bank Debt (Textual)            
Variable interest rate         5.68%  
Original notional amount         $ 1,000,000  
Interest rate swaps [Member] | Mortgage Loan Two [Member]            
Bank Debt (Textual)            
Variable interest rate         4.73%  
Original notional amount         $ 2,500,000  
TD Bank N.A. [Member] | Loan One [Member]            
Bank Debt (Textual)            
Maximum limit on issuance of loan, rate       80.00%    
Proceeds from issuance of loan       $ 1,000,000    
Interest payments, term       10 years    
Loan amortization, term       15 years    
Balloon principal payment       $ 451,885    
Balloon principal payment due, description       Due during the third quarter of 2020.    
Outstanding amount of loan         562,604  
TD Bank N.A. [Member] | Mortgage Loan Two [Member]            
Bank Debt (Textual)            
Proceeds from issuance of loan     $ 2,500,000      
Interest payments, term     10 years      
Loan amortization, term     20 years      
Balloon principal payment     $ 1,550,000      
Balloon principal payment due, description     Due during the third quarter of 2025.      
Outstanding amount of loan         $ 2,233,768  
TD Bank N.A. [Member] | Construction Loan Three [Member]            
Bank Debt (Textual)            
Maximum limit on issuance of loan, rate         80.00%  
Proceeds from issuance of loan         $ 3,799,286  
Loan amortization, term         7 years  
Outstanding amount of loan         $ 3,940,000  
Variable interest rate with LIBOR, description         Variable rate equal to the one-month LIBOR (adjusted at each monthly payment date) plus a margin of 2.25% through September 2018, at which time the loan converted to a seven-year term loan facility at the same variable interest rate (which was equal to 4.60% as of December 31, 2018).  
Loan conversion, term         7 years  
TD Bank N.A. [Member] | Construction Loan Four [Member]            
Bank Debt (Textual)            
Maximum limit on issuance of loan, description         Not to exceed 80% (75% prior to the 2017 amendments).  
Proceeds from issuance of loan         $ 2,560,000  
Interest payments, term         10 years  
Loan amortization, term         20 years  
Balloon principal payment         $ 1,408,000  
Balloon principal payment due, description         Due during the first quarter of 2027.  
Outstanding amount of loan         $ 2,464,000  
Variable interest rate with LIBOR, description         Variable rate equal to the one-month LIBOR (adjusted at each monthly payment date) plus a margin of 2.25% through March 2018, at which time the loan converted to a term loan facility at the same variable interest rate (which was equal to 4.60% as of December 31, 2018).  
TD Bank N.A. [Member] | Mortgage Loan Five [Member]            
Bank Debt (Textual)            
Proceeds from issuance of loan $ 340,000          
Interest payments, term 10 years          
Loan amortization, term 20 years          
Balloon principal payment $ 208,000          
Balloon principal payment due, description Due during the first quarter of 2027.          
Outstanding amount of loan         $ 320,767  
Variable interest rate with LIBOR, description Variable rate equal to the one-month LIBOR (adjusted at each monthly payment date) plus a margin of 2.25% (which was equal to 4.71% as of December 31, 2018).          
Warehouse and storage facility | ft² 4,114          
TD Bank N.A. [Member] | Credit Facilities [Member]            
Bank Debt (Textual)            
Credit facility aggregate value       $ 500,000    
Variable interest rate with LIBOR, description       Interest on borrowings against the line of credit is variable at the higher of 4.25% per annum or the one-month LIBOR plus 3.5% per annum.