Summary of Significant Accounting Policies - Stockholder's Equity (Details)	1 Months Ended		3 Months Ended
	Jul. 31, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2021 Vote $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jun. 30, 2020 $ / shares
Summary of Significant Accounting Policies
Total number of shares of all classes of stock authorized			110,000,000
Common stock, par value | $ / shares			$ 0.001	$ 0.001
Preferred stock, shares authorized			10,000,000
Common stock, shares authorized			100,000,000	100,000,000
Votes per share | Vote			1
Ordinary share of dividend | $ / shares					$ 0.04
Cash dividends | $				$ 606,000
Number of shares re-acquired	13,000	10,000
Payments to acquire own shares | $	$ 141,000	$ 107,000