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STOCK BASED COMPENSATION: (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Feb. 05, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 706 $ 684 $ 700        
Stock Incentive Plan 2011              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common Stock, Capital Shares Reserved for Future Issuance (in shares)             700,000
Granted (shares)           149,069  
Number of additional shares authorized (shares)       550,931      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       16,562,000 20,943,000    
Vesting period       3 years      
Total compensation cost not yet recognized, stock options       $ 741 $ 674    
Total compensation cost not yet recognized, period for recognition       1 year 6 months      
Options, vested in period, fair value       $ 900 $ 1,100    
Restricted Stock | First Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price of common stock (percent)       33.00%      
Restricted Stock | Second Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price of common stock (percent)       33.00%      
Restricted Stock | Third Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price of common stock (percent)       34.00%