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Stock-Based Compensation Plan (Details) - Independent directors compensation plan [Member] - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Shares    
Outstanding, Beginning balance 9,000 4,000
Exercisable, Beginning balance 9,000 4,000
Granted 5,000
Exercised
Forfeited
Outstanding, Ending balance 9,000 9,000
Exercisable, Ending balance 9,000 9,000
Average Exercise Price per Share    
Outstanding, Beginning balance $ 5.4 $ 10.2
Exercisable, Beginning balance 5.4 10.2
Granted 1.6
Exercised
Forfeited
Outstanding, Ending balance 5.4 5.4
Exercisable, Ending balance $ 5.4 $ 5.4
Weighted Average Remaining Contractual Term in Years    
Outstanding, Beginning balance 6 years 4 months 28 days 3 years 9 months 7 days
Exercisable, Beginning balance 6 years 4 months 28 days 3 years 9 months 7 days
Granted 0 years 10 years
Exercised 0 years 0 years
Forfeited 0 years 0 years
Outstanding, Ending balance 5 years 4 months 28 days 6 years 4 months 28 days
Exercisable, Ending balance 5 years 4 months 28 days 6 years 4 months 28 days