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New Markets Tax Credit (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Dec. 31, 2016
Jul. 31, 2013
Jun. 30, 2020
New Market Tax Credit Disclosure [Line Items]      
Investment fund cash     $ 0.8
Chase and US Bank [Member]      
New Market Tax Credit Disclosure [Line Items]      
Contribution to affiliate   $ 5.6  
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     $ 1.6
Contribution liability, current     0.5
Contribution liability, noncurrent     $ 1.1
Twain Investment Fund 192 [Member] | Tile Shop Holdings [Member]      
New Market Tax Credit Disclosure [Line Items]      
Syndicate costs 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%    
Tile Shop Investment Fund [Member]      
New Market Tax Credit Disclosure [Line Items]      
Contribution to affiliate   4.4  
Contribution liability compliance period     7 years
Contribution liability     $ 0.1
Tile Shop Investment Fund [Member] | Tile Shop Holdings [Member]      
New Market Tax Credit Disclosure [Line Items]      
Syndicate costs   1.2  
Tile Shop Investment Fund [Member] | Tile Shop Lending [Member]      
New Market Tax Credit Disclosure [Line Items]      
Loan amount   13.5  
Oklahoma [Member] | U.S. Bank Community [Member]      
New Market Tax Credit Disclosure [Line Items]      
Financing agreement project cost $ 9.2    
U.S. Bank Community [Member] | Twain Investment Fund 192 [Member]      
New Market Tax Credit Disclosure [Line Items]      
Contribution to affiliate $ 3.2    
Chase and US Bank [Member]      
New Market Tax Credit Disclosure [Line Items]      
Contribution to affiliate   5.6  
Chase and US Bank [Member] | Oklahoma [Member]      
New Market Tax Credit Disclosure [Line Items]      
Financing agreement project cost   $ 19.1