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Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 08, 2018
Aug. 13, 2017
Aug. 09, 2017
Sep. 04, 2012
Feb. 28, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2015
Dec. 31, 2007
Equity (Textual)                  
Intrinsic value of options exercised           $ 3 $ 348    
Unrecognized compensation cost related to non-vested share-based compensation             $ 3    
Accumulated cash dividend distributions of per share   $ 0.13     $ 0.13        
Aggregate dividend value   $ 5,779     $ 5,784        
Dividend paid date   Sep. 13, 2017     Mar. 26, 2018        
Dividend distribution maximum percentage     75.00% 50.00%          
Subsequent Event [Member]                  
Equity (Textual)                  
Accumulated cash dividend distributions of per share $ 0.155                
Aggregate dividend value $ 7,562                
Dividend paid date Sep. 05, 2018                
2007 Plan [Member]                  
Equity (Textual)                  
Reserved ordinary shares for issuance                 1,500,000
Additional ordinary shares               250,000 1,000,000
Aggregate of ordinary shares for future grants           1,000,000      
Expiration period               10 years  
Exercisable           10 years      
Expiration date               Aug. 01, 2027  
2007 Plan [Member] | Minimum [Member]                  
Equity (Textual)                  
Options vest years           3 years      
2007 Plan [Member] | Maximum [Member]                  
Equity (Textual)                  
Options vest years           4 years