Note Payable - Revolving Credit Line - Additional Information (Details) - BankRI [Member] - Line [Member] - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2022
Line Of Credit Facility [Line Items]
Revolving credit line, maximum borrowing capacity	$ 2,000,000
Maturity date	Mar. 31, 2024
Interest rate, description		Amounts outstanding under the Agreement bear interest at the rate of the one-month LIBOR plus 200 basis points but not less than 3.25% or, at the option of the Company, the Wall Street Journal Prime Rate.
Revolving credit line, collateral, description		Borrowings under the Line are secured by a First Mortgage on Parcel 5 in the Capital Center District in Providence, Rhode Island (the “Property”).
Revolving credit line, covenant terms		The Agreement contains other restrictive covenants, including, among others, a $250,000 limitation on the purchase of its outstanding capital stock in any twelve-month period.
Limitation on the purchase of outstanding capital stock	$ 250,000
Advances made under line	$ 0
LIBOR [Member]
Line Of Credit Facility [Line Items]
Variable rate basis		one-month LIBOR plus 200 basis points
Maximum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	1.20
Maximum [Member] | LIBOR [Member]
Line Of Credit Facility [Line Items]
Interest rate	3.25%
Minimum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	1.0
Property [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	1.25
Property [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	1.0