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Summary of Business and Significant Accounting Policies - Costs (Detail) - USD ($)	6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Summary of Business and Significant Accounting Policies
Deferred financing costs	$ 981,000		$ 981,000
Accumulated amortization of deferred financing costs	898,000		$ 740,000
Amortization of deferred financing costs	$ 158,000	$ 108,000

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Amount of accumulated amortization of debt issuance costs.

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Amount of amortization expense attributable to debt issuance costs.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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