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Stock-Based Compensation Plan (Details) - Employees and independent directors [Member] - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Outstanding, Beginning balance 9,000 4,000 4,000
Exercisable, Beginning balance 9,000 4,000 4,000
Granted 5,000
Exercised
Forfeited
Outstanding, Ending balance 9,000 9,000 4,000
Exercisable, Ending balance 9,000 9,000 4,000
Average Exercise Price per Share      
Outstanding, Beginning balance $ 5.4 $ 10.2 $ 10.2
Exercisable, Beginning balance 5.4 10.2 10.2
Granted 1.6
Exercised
Forfeited
Outstanding, Ending balance 5.4 5.4 10.2
Exercisable, Ending balance $ 5.4 $ 5.4 $ 10.2
Weighted Average Remaining Contractual Term in Years      
Outstanding, Beginning balance 6 years 4 months 28 days 3 years 9 months 7 days 4 years 9 months 7 days
Exercisable, Beginning balance 6 years 4 months 28 days 3 years 9 months 7 days 4 years 9 months 7 days
Granted 0 years 10 years 0 years
Exercised 0 years 0 years 0 years
Forfeited 0 years 0 years 0 years
Outstanding, Ending balance 6 years 1 month 27 days 6 years 4 months 28 days 3 years 9 months 7 days
Exercisable, Ending balance 6 years 1 month 27 days 6 years 4 months 28 days 3 years 9 months 7 days