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Options outstanding and options exercisable (Details){Stockholder Equity}
 12 Months Ended
Jun. 26, 2016
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Options Outstanding at June 26, 2016  
Range of Exercise Prices 1.55 - 1.95 81,306
Range of Exercise Prices 1.96 - 2.35 90,000
Range of Exercise Prices 2.36 - 2.75 390,000
Range of Exercise Prices 2.76 - 3.30 55,000
Range of Exercise Prices 5.51 - 5.74 8,664
Range of Exercise Prices 5.95 - 6.25 153,300
Range of Exercise Prices 6.26 - 8.16 69,286
Total Options outstanding and options exercisable 847,556
Options Outstanding Weighted-Average Remaining Contractual Life (Years)  
Range of Exercise Prices 1.55 - 1.95 3.1
Range of Exercise Prices 1.96 - 2.35 2.0
Range of Exercise Prices 2.36 - 2.75 6.2
Range of Exercise Prices 2.76 - 3.30 6.0
Range of Exercise Prices 5.51 - 5.74 7.0
Range of Exercise Prices 5.95 - 6.25 7.9
Range of Exercise Prices 6.26 - 8.16 8.3
Total Options outstanding and options exercisable 5.9
Options Outstanding Weighted-Average Exercise Price  
Range of Exercise Prices 1.55 - 1.95 1.9
Range of Exercise Prices 1.96 - 2.35 2.32
Range of Exercise Prices 2.36 - 2.75 2.58
Range of Exercise Prices 2.76 - 3.30 3.11
Range of Exercise Prices 5.51 - 5.74 5.74
Range of Exercise Prices 5.95 - 6.25 6.06
Range of Exercise Prices 6.26 - 8.16 9.85
Total Options outstanding and options exercisable 3.77
Options Exercisable at June 26, 2016  
Range of Exercise Prices 1.55 - 1.95 81,306
Range of Exercise Prices 1.96 - 2.35 90,000
Range of Exercise Prices 2.36 - 2.75 250,000
Range of Exercise Prices 2.76 - 3.30 55,000
Range of Exercise Prices 5.51 - 5.74 8,664
Range of Exercise Prices 5.95 - 6.25 66,150
Range of Exercise Prices 6.26 - 8.16 7,500
Total Options outstanding and options exercisable 558,620
Options Exercisable Weighted-Average Exercise Price  
Range of Exercise Prices 1.55 - 1.95 1.90
Range of Exercise Prices 1.96 - 2.35 2.32
Range of Exercise Prices 2.36 - 2.75 2.58
Range of Exercise Prices 2.76 - 3.30 3.11
Range of Exercise Prices 5.51 - 5.74 5.74
Range of Exercise Prices 5.95 - 6.25 3.40
Range of Exercise Prices 6.26 - 8.16 8.12
Total Options outstanding and options exercisable 2.71