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STOCK BASED COMPENSATION: (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Feb. 05, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       3 years      
Share-based Payment Arrangement, Expensed and Capitalized, Amount $ 799 $ 745 $ 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)           186,072  
Number of additional shares authorized (shares)       513,928      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       19,783,000 17,220,000    
Vesting period       3 years      
Total compensation cost not yet recognized, stock options       $ 822 $ 674    
Total compensation cost not yet recognized, period for recognition       1 year 6 months      
Options, vested in period, fair value       $ 800 $ 732    
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%