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Shareholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 24, 2020
Oct. 03, 2019
Dec. 13, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Oct. 08, 2019
Nov. 29, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Stock repurchased during period, shares             87,534 359,959    
Share-based compensation, amount recognized         $ 0 $ 0 $ 27,000 $ 0    
2011 Director Stock Option Plan [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Options granted             50,000 0    
2019-2020 Common Share Repurchase Program [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Stock repurchased during period, shares 87,534 0                
Stock repurchased during period, value $ 101,000                  
2018 Common Share Repurchase Program [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Stock repurchased during period, shares     359,959 300,000            
Additional shares authorized for purchase       450,000            
Stock repurchased during period value excluding fees and expenses     $ 372,000              
Maximum [Member] | 2019-2020 Common Share Repurchase Program [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Amount of shares authorized to be repurchased                 $ 750,000  
Maximum [Member] | 2018 Common Share Repurchase Program [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares authorized to be repurchased                   300,000