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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details) - USD ($)	6 Months Ended		68 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock outstanding (in shares)	33,490,550		33,490,550
Cash dividends to common stockholders	$ 1,661,110	$ 6,621,194
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares repurchased	$ 7,348	$ 1,750,839
Number of treasury shares acquired (in shares)	2,632	299,402
Average cost per share (in dollars per share)	$ 2.79	$ 5.85
Common Stock | 2015 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount to be repurchased				$ 5,000,000.0
Value of shares repurchased			$ 4,000,000.0
Treasury stock acquired (in shares)	0		706,858
Average cost per share (in dollars per share)			$ 5.72

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