Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Narrative (Details)

v3.19.1
Organization and Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Impairment or disposal of long-lived assets $ 0 $ 0  
Impairment of goodwill and intangible asset 0    
Total revenue 47,480,256 34,438,696  
Operating lease right-of-use asset 3,215,736    
Operating lease liability 3,204,040    
ASU 2016-02      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Operating lease right-of-use asset     $ 4,300,000
Operating lease liability     $ 4,300,000
Texas-Southwest | Restatement Adjustment      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total revenue   $ (922,000)  
Type of cost, good or service [Extensible List]   gv:ElectricalConstructionOperationsMember  
Other Electrical Construction | Restatement Adjustment      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total revenue   $ 922,000  
Type of cost, good or service [Extensible List]   gv:ElectricalConstructionOperationsMember  
Fixed Rate Long-term Installment Notes Payable | Notes Payable      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Debt, fair value $ 263,000    
Fixed Rate Long-term Installment Notes Payable | Notes Payable | Discount Rate      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value measurement input, debt 0.0429