New Markets Tax Credit (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2023	Dec. 31, 2016
New Market Tax Credit Disclosure [Line Items]
Investment fund cash		$ 0.7
Twain Investment Fund 192 [Member]
New Market Tax Credit Disclosure [Line Items]
Net proceeds from contribution	$ 1.9
Contribution liability		$ 0.1
Twain Investment Fund 192 [Member] | Tile Shop Holdings [Member]
New Market Tax Credit Disclosure [Line Items]
Syndicate costs	1.3		$ 1.3
Twain Investment Fund 192 [Member] | Tile Shop Lending [Member]
New Market Tax Credit Disclosure [Line Items]
Loan amount	$ 6.7
Loan interest rate	1.37%
Loan maturity date		Dec. 31, 2046
U.S. Bank Community [Member] | Twain Investment Fund 192 [Member]
New Market Tax Credit Disclosure [Line Items]
Contribution to affiliate	$ 3.2		3.2
U.S. Bank Community [Member] | Oklahoma [Member]
New Market Tax Credit Disclosure [Line Items]
Financing agreement project cost	$ 9.2		$ 9.2