Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.8.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Taxes (Textual) [Abstract]          
Federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%  
NOL expiring in 2033 if not utilized $ 90   $ 90    
NOL expiring in 2034 if not utilized 804   804    
NOL expiring in 2035 if not utilized 479   479    
NOL expiring in 2036 if not utilized $ 1,700   $ 1,700    
Subsidiaries [Member]          
Income Taxes (Textual) [Abstract]          
Net operating loss for federal income tax purposes         $ 3,000
State [Member] | Corridor Public Holdings, Inc. and Corridor Private Holdings, Inc. [Member]          
Income Taxes (Textual) [Abstract]          
Blended state tax rate 3.78% 2.82% 3.78% 2.82%  
State [Member] | Missouri [Member] | Mowood Corridor, Inc. And Corridor MoGas [Member]          
Income Taxes (Textual) [Abstract]          
Blended state tax rate 5.00% 5.00% 5.00% 5.00%