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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts $ 12 $ 12
Accumulated depreciation, property plant and equipment $ 32,814 $ 31,878
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 34,238,382 33,992,054
Common stock, shares outstanding 34,238,382 33,992,054