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- 1347 Investors LLC (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Nov. 19, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jul. 26, 2017
Sep. 21, 2015
Limited Liability Company            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage     26.70% 26.70%    
Equity Method Investee            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage     47.60% 47.60% 51.00% 33.30%
Board of Directors Chairman            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage     40.60% 40.60%    
Subsequent Event            
Related Party Transaction [Line Items]            
Consideration received, cash $ 0.6 $ 0.6        
Consideration received (in shares) 594,750 594,750        
Consideration received, warrants (in shares) 400,000 400,000        
Warrant exercise price (in dollars per share) $ 15 $ 15        
Kingsway Financial Services, Inc | Fundamental Global Investors, LLC            
Related Party Transaction [Line Items]            
Ownership percentage (less than at June 30, 2019)     5.00% 5.00%