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Acquisitions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
Aug. 20, 2019
Jul. 26, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Goodwill     $ 4,453,000 $ 4,453,000 $ 0
American Electric          
Business Acquisition [Line Items]          
Total purchase price   $ 11,088,573      
Current Assets   3,611,000      
Property, plant and equipment, net   532,000      
Investment in foreign joint venture   9,333,000      
Other noncurrent assets   410,000      
Total identifiable assets   13,886,000      
Accounts payable and other accrued expenses   (2,714,000)      
Accrued liabilities and other current liabilities   (138,000)      
Other Liabilities   (84,000)      
Total liabilities assumed   (2,936,000)      
Goodwill   $ 139,000      
Diversenergy, LLC          
Business Acquisition [Line Items]          
Total purchase price $ 5,000,000        
Current Assets 164,000        
Property, plant and equipment, net 507,000        
Other noncurrent assets 114,000        
Total identifiable assets 785,000        
Current liabilities (99,000)        
Total liabilities assumed (99,000)        
Goodwill $ 4,314,000