Note 7 - Mortgage Notes Payable (Details Textual) $ in Millions	Dec. 31, 2021 USD ($)
The 300 N.P [Member] | Mortgage Note, Due June 11, 2022 [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 2.2
The 300 N.P [Member] | Mortgage Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.95%	[1],[2]
Minimum [Member] | Model Home [Member] | Mortgage Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Maximum [Member] | Model Home [Member] | Mortgage Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.33%

[1] Interest rates as of December 31, 2021.

[2] The mortgage note payable for 300 N.P. is an amortizing loan with a balloon payment of $2.2 million due at maturity, on June 11, 2022, and is no longer subject to defeasance or yield maintenance. The Company expects to pay this note in full at or before maturity with proceeds from property sales, property financing and other available cash on hand.