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Stock Based Compensation (Schedule of Stock Option Activity) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Number of Shares Subject To Options
Balance at July 1, 2018	222,854
Granted	55,089
Exercised	(9,199)
Forfeited or expired	(1,555)
Outstanding at December 31, 2018	267,189	222,854
Vested or expected to vest at December 31, 2018	251,262
Exercisable at December 31, 2018	161,650
Weighted Average Exercise Price
Balance at July 1, 2018	$ 24.29
Granted	27.20
Exercised	21.75
Forfeited or expired	25.19
Outstanding at December 31, 2018	24.97	$ 24.29
Vested or expected to vest at December 31, 2018	24.98
Exercisable at December 31, 2018	$ 25.09
Weighted Average Remaining Contractual Term
Outstanding	6 years 8 months 16 days	6 years 3 months 4 days
Granted	9 years 11 months 8 days
Vested or expected to vest at December 31, 2018	6 years 6 months 14 days
Exercisable at December 31, 2018	4 years 11 months 12 days
Aggregate Intrinsic Value
Outstanding at December 31, 2018	$ 282,645
Vested or expected to vest at December 31, 2018	260,376
Exercisable at December 31, 2018	$ 132,566

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