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STOCKHOLDERS' EQUITY: - Employee Stock Purchase Plan (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended
Nov. 30, 2018
$ / shares
Nov. 30, 2018
$ / shares
Jan. 31, 2015
$ / shares
Jan. 31, 2015
$ / shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Retained earnings            
Dividends paid as cash dividend (in dollars per share)         $ 2.00 $ 2.25
Employee Stock Purchase 2015 Plan            
Information related to compensation cost            
Purchase price for initial subscription (in dollars per share) | (per share)     $ 2.63 $ 38.44    
Percentage of title acquired by employee in every two years on shares paid in previous two years         50.00%  
Period of plan         8 years  
Ratio of bonus shares granted to participant         0.1  
Stock based compensation expense | $           $ 0.3
Unrecognized compensation expense | $           $ 0.5
Stock award activity, Shares            
Outstanding shares at the beginning of the period | shares         845,895 867,234
Exercised (in shares) | shares         (757,164) (16,394)
Outstanding shares at the end of the period | shares         88,731 850,840
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the period (in dollars per share)         $ 2.63 $ 2.63
Exercised (in dollars per share)         2.63 2.63
Outstanding shares at the end of the period (in dollars per share)         $ 2.63 $ 2.63
Employee Stock Purchase 2018 Plan            
Information related to compensation cost            
Purchase price for initial subscription (in dollars per share) | (per share) $ 1.86 $ 37.89        
Percentage of title acquired by employee in every two years on shares paid in previous two years         50.00%  
Period of plan         8 years  
Ratio of bonus shares granted to participant         0.1  
Stock based compensation expense | $         $ 0.3 $ 0.3
Unrecognized compensation expense | $         $ 1.8 $ 3.0
Stock award activity, Shares            
Outstanding shares at the beginning of the period | shares         2,754,506 3,173,924
Exercised (in shares) | shares         (694,565) (160,236)
Outstanding shares at the end of the period | shares         2,059,941 3,013,688
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the period (in dollars per share)         $ 1.86 $ 1.86
Exercised (in dollars per share)         1.86 1.86
Outstanding shares at the end of the period (in dollars per share)         $ 1.86 $ 1.86