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Stock-based Compensation, Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Number Outstanding [Roll Forward]        
Outstanding at beginning of period (in shares)     450,000 455,000
Granted during period (in shares)     0 0
Exercised during period (in shares)     0 0
Forfeited or expired during period (in shares)     0 (5,000)
Outstanding at end of period (in shares) 450,000 450,000 450,000 450,000
Exercisable at end of period (in shares) 450,000 360,000 450,000 360,000
Weighted Average Exercise Price [Abstract]        
Outstanding at beginning of period (in dollars per share)     $ 1.62 $ 1.67
Granted during period (in dollars per share)     0 0
Exercised during period (in dollars per share)     0 0
Forfeited or expired during period (in dollars per share)     0 6.00
Outstanding at end of period (in dollars per share) $ 1.62 $ 1.62 1.62 1.62
Exercisable at end of period (in dollars per share) $ 1.62 $ 1.62 $ 1.62 $ 1.62
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]        
Stock based compensation expense $ 0 $ 10 $ 7 $ 19