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Stockholders' Equity - Narrative (Details) - USD ($)	1 Months Ended		12 Months Ended		66 Months Ended
	Jun. 30, 2019	Jun. 30, 2015	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	May 12, 2015
Class of Stock [Line Items]
Common stock, outstanding shares	33,183,730		33,183,730	33,080,543	33,183,730
Common stock dividends paid			$ 13,272,058	$ 11,594,541	$ 59,400,000
Total cost of treasury shares acquired			$ 156,791	$ 571,083
Common Stock
Class of Stock [Line Items]
Purchases of treasury stock (shares)			18,424	73,208
2015 Share Repurchase Program | Common Stock
Class of Stock [Line Items]
Amount authorized to be repurchased						$ 5,000,000
Purchases of treasury stock (shares)	430	266,192	18,424	73,208
Treasury stock acquired, average cost (in USD per share)	$ 6.07	$ 6.05	$ 8.51	$ 7.80
Total cost of treasury shares acquired		$ 1,611,620	$ 156,791	$ 571,083

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