Long-Term Debt (Details Narrative) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Feb. 06, 2019	Nov. 17, 2017
Capitalized interest	$ 948	$ 870		$ 2,823	$ 1,960
Debt cost amortization	34			102
Riverfront permanent loan	89,027			89,027		$ 88,925
Wells Fargo Bank, N.A.
Term						5 years
Revolving Credit Agreement							$ 20,000
Letters of credit issued	411			411
Borrowed under the revolver	0			0
Available for borrowing	19,589			19,589
Available to pay dividends	$ 219,000			$ 219,000
Letter of credit fee				1.00%
Interest rate	1.149%			1.149%
Covenant compliance				all
Dock 79 EagleBank
Term			120 months
Riverfront permanent loan								$ 90,000
Interest rate								4.125%
Payment terms			During the first 48 months of the loan term, the Joint Venture will make monthly payments of interest only, and thereafter, make monthly payments of principal and interest in equal installments based upon a 30-year amortization period.
Wells Fargo Level I
Commitment fee				0.15%
Interest rate over DAILY 1 MONTH LIBOR				1.00%
Wells Fargo Level II
Commitment fee				0.20%
Interest rate over DAILY 1 MONTH LIBOR				1.25%
Wells Fargo Level III
Commitment fee				0.25%
Interest rate over DAILY 1 MONTH LIBOR				1.50%