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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts $ 12 $ 16
Accumulated depreciation, property plant and equipment $ 31,878 $ 30,066
Preferred stock, par value (in dollar per share) $ 0.10 $ 0.10
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollar per share) $ 0.10 $ 0.10
Common stock, shares authorized 74,000,000 74,000,000
Common stock, shares issued 33,992,054 33,868,624
Common stock, shares outstanding 33,992,054 33,868,624