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New Market Tax Credit (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 31, 2013
Sep. 30, 2019
Dec. 31, 2016
New Market Tax Credit Disclosure [Line Items]        
Restricted 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     $ 1.9  
Contribution liability, current     0.5  
Contribution liability, noncurrent     $ 1.4  
Twain Investment Fund 192 [Member] | U.S. Bank Community [Member]        
New Market Tax Credit Disclosure [Line Items]        
Contribution to affiliate $ 3.2      
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%      
Tile Shop Investment Fund [Member]        
New Market Tax Credit Disclosure [Line Items]        
Contribution to affiliate   $ 4.4    
Contribution liability compliance period   7 years 7 years  
Contribution liability     $ 0.6  
Contribution liability, current     $ 0.6  
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     $ 9.2
Chase and US Bank [Member] | Oklahoma [Member]        
New Market Tax Credit Disclosure [Line Items]        
Financing agreement project cost   $ 19.1