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Incentive Plan - Summary of stock option activity (Details) - Equity Incentive Plans
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Shares:    
Outstanding, Beginning of Period | shares 509,000 529,000
Granted | shares 0 0
Exercised | shares (11,250) (31,250)
Forfeited | shares 0 0
Outstanding, End of Period | shares 497,750 497,750
Vested and expected to vest at March 31, 2019 | shares 495,150 495,150
Exercisable at March 31, 2019 | shares 484,750 484,750
Weighted-Average Exercise Price (in dollars per share):    
Outstanding, Beginning of Period | $ / shares $ 12.83 $ 12.77
Granted | $ / shares 0 0
Exercised | $ / shares 14.59 12.49
Forfeited | $ / shares 0 0
Outstanding, End of Period | $ / shares 12.79 12.79
Vested and expected to vest at March 31, 2019 | $ / shares 12.75 12.75
Exercisable at March 31, 2019 | $ / shares $ 12.6 $ 12.6
Weighted- Average Remaining Contractual Term (Years):    
Outstanding at year end 4 years 6 months 11 days 4 years 6 months 11 days
Vested and expected to vest at March 31, 2019 4 years 6 months 7 days 4 years 6 months 7 days
Exercisable at March 31, 2019 4 years 5 months 12 days 4 years 5 months 12 days
Aggregate Intrinsic Value ($000):    
Outstanding at year end | $ $ 3,551 $ 3,551
Vested and expected to vest at March 31, 2019 | $ 3,550 3,550
Exercisable at March 31, 2019 | $ $ 3,546 $ 3,546