Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	$ 15,700	$ 15,700
Finite-lived intangible assets, Accumulated amortization	(8,666)	(8,468)
Finite-lived intangible assets, Net book value	7,034	7,232
Trade name [Member]
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	5,900	5,900
Finite-lived intangible assets, Accumulated amortization	0	0
Finite-lived intangible assets, Net book value	5,900	5,900
Customer relationships [Member]
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Cost	9,800	9,800
Finite-lived intangible assets, Accumulated amortization	(8,666)	(8,468)
Finite-lived intangible assets, Net book value	$ 1,134	$ 1,332