Annual report pursuant to Section 13 and 15(d)

Goodwill (Details)

v3.10.0.1
Goodwill (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 24, 2014
Jun. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 01, 2018
Goodwill [Line Items]              
Goodwill     $ 0 $ 5,486,000     $ 5,490,000
Restriction period for conversion of common units issued into shares 1 year            
Impairment of goodwill     $ 5,486,000 0 $ 0    
Operating Companies [Member]              
Goodwill [Line Items]              
Goodwill $ 7,000,000            
Fair value discount on common units issued for acquisition   $ 1,180,000          
Consideration paid with common units   $ 6,750,000          
Allocation to finite-lived intangibles           $ 337,000  
Adjustments to goodwill       $ 0 $ 0