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Inventories
 12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
4.
Inventories

Inventories consisted of the following:

 

 

December 31,

 

(table only in thousands)

 

2021

 

 

2020

 

Raw materials

 

$

13,405

 

 

$

14,262

 

Work in process

 

 

5,147

 

 

 

5,594

 

Finished goods

 

 

674

 

 

 

496

 

Obsolescence allowance

 

 

(2,174

)

 

 

(3,009

)

Total inventories

 

$

17,052

 

 

$

17,343

 
Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.1 million, $0.5 million and $0.3 million during 2021, 2020 and 2019, respectively. Items charged to the allowance for inventory write-offs were $0.9 million, $0.1 million and $0.1 million, during 2021, 2020 and 2019, respectively.