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Segment and Geographic Information - Summary of net sales by the countries and property, plant and equipment, net of accumulated depreciation (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenues [Abstract]          
Revenues $ 47,573 $ 41,329 $ 79,685 $ 73,219  
Interest Expense [Abstract]          
Interest expense 437 669 974 1,363  
Investment Income, Net [Abstract]          
Interest income 93 211 476 347  
Depreciation [Abstract]          
Depreciation 1,491 1,560 3,021 3,227  
Gross Profit [Abstract]          
Gross Profit 3,529 (2,970) 4,294 (2,295)  
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, net 60,498   60,498   $ 63,158
Assets [Abstract]          
Assets 197,941   197,941   183,408
Corporate [Member]          
Investment Income, Net [Abstract]          
Interest income 93 211 476 347  
United States [Member]          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, net 39,488   39,488   41,656
Assets [Abstract]          
Assets 89,716   89,716   88,395
United States [Member] | Produce Business [Member]          
Revenues [Abstract]          
Revenues 40,281 33,661 69,596 61,860  
Interest Expense [Abstract]          
Interest expense 5 32 12 65  
Depreciation [Abstract]          
Depreciation 1,040 1,005 2,086 2,025  
Gross Profit [Abstract]          
Gross Profit (99) (5,441) 1,218 (4,736)  
Canada [Member]          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, net 18,669   18,669   18,759
Assets [Abstract]          
Assets 105,697   105,697   92,067
Canada [Member] | Produce Business [Member]          
Revenues [Abstract]          
Revenues 7,174 7,423 9,821 10,802  
Interest Expense [Abstract]          
Interest expense 418 618 933 1,261  
Depreciation [Abstract]          
Depreciation 298 328 599 747  
Gross Profit [Abstract]          
Gross Profit 3,822 2,678 3,448 2,738  
Canada [Member] | Energy Business [Member]          
Interest Expense [Abstract]          
Interest expense 14 19 29 37  
Depreciation [Abstract]          
Depreciation 153 227 336 455  
Gross Profit [Abstract]          
Gross Profit (194) (207) (372) (297)  
Energy - Canada [Member]          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, net 2,341   2,341   2,743
Assets [Abstract]          
Assets 2,528   2,528   $ 2,946
Energy - Canada [Member] | Energy Business [Member]          
Revenues [Abstract]          
Revenues $ 118 $ 245 $ 268 $ 557