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Shareholders' Equity - Summary of Stock Option Activity (Details) - Stock Option Grants [Member] - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Options Outstanding, beginning balance 147,000 156,000
Options Granted 3,000 2,000
Options Exercised
Options Cancelled (6,000) (6,000)
Options Forfeited (2,000) (4,000)
Options Expired (1,000)
Options Outstanding, ending balance 142,000 147,000
Options vested and exercisable 140,000  
Weighted Average Exercise Price Per Share Outstanding, beginning balance $ 18.20 $ 17.74
Weighted Average Exercise Price Per Share Granted 3.15 4.44
Weighted Average Exercise Price Per Share Exercised
Weighted Average Exercise Price Per Share Cancelled 13.32 10.42
Weighted Average Exercise Price Per Share Forfeited 6.24 6.38
Weighted Average Exercise Price Per Share Expired 16.00
Weighted Average Exercise Price Per Share Outstanding, ending balance 18.26 $ 18.20
Weighted Average Exercise Price Per Share vested and exercisable $ 18.43  
Weighted Average Remaining Contractual Life (in years) Outstanding, beginning balance   7 years 1 month 13 days
Weighted Average Remaining Contractual Life (in years) Outstanding, ending balance 5 years 1 month 20 days 6 years 29 days
Weighted Average Remaining Contractual Life (in years) vested and exercisable 5 years 1 month 6 days  
Aggregate Intrinsic Value Outstanding, beginning balance
Aggregate Intrinsic Value Outstanding, ending balance  
Aggregate Intrinsic Value vested and exercisable