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Stockholders' Equity - Repurchases of our common stock (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 11, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Stock Repurchased During Period, Shares   19,800 25,150 42,500 28,750 17,750 20,500 15,800 34,200 116,200 88,250
Treasury Stock Acquired, Average Cost Per Share $ 4.00 $ 2.68 $ 2.75 $ 3.00 $ 2.50 $ 2.30 $ 2.24 $ 2.41 $ 2.20 $ 2.77 $ 2.27
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 277,774 $ 330,838 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 277,774 $ 0
Publicly Announced Plans Or Programs [Member]                      
Stock Repurchased During Period, Shares   0 0 0 0 0 0 0 0 0 0