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Options outstanding and options exercisable (Details)
Shares Outstanding at June 30, 2013
Weighted-Average Remaining Contractual Life (Years)
Options Outstanding Weighted-Average Exercise Price
Shares Exercisable at June 30, 2013
Options Exercisable Weighted-Average Exercise Price
Total Options outstanding and options exercisable at Jun. 30, 2012          
Range of Exercise Prices 1.55 - 1.95 158,506 6.3 1.88 145,839 1.88
Range of Exercise Prices 1.96 - 2.35 145,000 5.1 2.29 145,000 2.29
Range of Exercise Prices 2.36 - 2.75 366,800 9.2 2.58 52,000 2.71
Range of Exercise Prices 2.76 - 3.30 131,000 7.5 3.13 116,600 3.13
Range of Exercise Prices 3.31 - 3.81 50,000 9.4 3.62    
Total Options outstanding and options exercisable, at Jun. 30, 2013 851,306 7.1 2.54 459,439 2.42