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Share Incentive Plans, Assumptions for Options Granted Under 2015 Plan (Details) - 2015 Plan [Member] - Stock Options [Member] - $ / shares
9 Months Ended
Mar. 20, 2019
Mar. 13, 2018
Mar. 07, 2018
May 17, 2017
Feb. 10, 2017
Sep. 30, 2019
February 10, 2017 [Member]            
Share Incentive Plans [Abstract]            
Number of options granted (in shares)         40,000  
Options outstanding (in shares)           30,700
Number exercisable (in shares)           19,150
Exercise price (in dollars per share)           $ 13.00
Remaining lives           7 years 4 months 13 days
Risk free interest rate           1.89%
Expected volatility           27.44%
Expected life           6 years
Dividend yield           0.00%
Fair value at grant date (in dollars per share)           $ 3.98
May 17, 2017 [Member]            
Share Incentive Plans [Abstract]            
Number of options granted (in shares)       93,819    
Options outstanding (in shares)           73,352
Number exercisable (in shares)           48,131
Exercise price (in dollars per share)           $ 15.41
Remaining lives           7 years 7 months 17 days
Risk free interest rate           1.76%
Expected volatility           26.92%
Expected life           6 years
Dividend yield           0.00%
Fair value at grant date (in dollars per share)           $ 4.60
March 7, 2018 [Member]            
Share Incentive Plans [Abstract]            
Number of options granted (in shares)     98,100      
Options outstanding (in shares)           89,272
Number exercisable (in shares)           30,532
Exercise price (in dollars per share)           $ 21.21
Remaining lives           8 years 5 months 8 days
Risk free interest rate           2.65%
Expected volatility           28.76%
Expected life           6 years
Dividend yield           0.83%
Fair value at grant date (in dollars per share)           $ 6.37
March 13, 2018 [Member]            
Share Incentive Plans [Abstract]            
Number of options granted (in shares)   26,000        
Options outstanding (in shares)           26,000
Number exercisable (in shares)           17,420
Exercise price (in dollars per share)           $ 21.49
Remaining lives           8 years 5 months 16 days
Risk free interest rate           2.62%
Expected volatility           28.76%
Expected life           5 years 5 months 28 days
Dividend yield           0.82%
Fair value at grant date (in dollars per share)           $ 6.18
March 20, 2019 [Member]            
Share Incentive Plans [Abstract]            
Number of options granted (in shares) 155,780          
Options outstanding (in shares)           152,040
Number exercisable (in shares)           0
Exercise price (in dollars per share)           $ 47.58
Remaining lives           9 years 5 months 23 days
Risk free interest rate           2.34%
Expected volatility           30.95%
Expected life           6 years
Dividend yield           0.42%
Fair value at grant date (in dollars per share)           $ 15.63