New Markets Tax Credit (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2022	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 compliance period		7 years
Contribution liability		$ 0.7
Contribution liability, current		0.5
Contribution liability, noncurrent		$ 0.2
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
Oklahoma [Member] | U.S. Bank Community [Member]
New Market Tax Credit Disclosure [Line Items]
Financing agreement project cost	$ 9.2		9.2
U.S. Bank Community [Member] | Twain Investment Fund 192 [Member]
New Market Tax Credit Disclosure [Line Items]
Contribution to affiliate	$ 3.2		$ 3.2