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Stock repurchase program (Details) (USD $)
9 Months Ended 0 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 18, 2013
Stock repurchase program announced on March 18, 2013
Mar. 31, 2014
Stock repurchase program announced on March 18, 2013
Stockholders Equity Note [Line Items]        
Authorized amount for stock repurchases     $ 10,000,000  
Payments for repurchase of common stock 7,899,000 24,209,000   7,900,000
Number of treasury shares acquired       1,268,658
Final price paid per share       $ 6.23
Reduction to common stock and APIC 4,100,000      
Charge to retained earnings $ 3,800,000