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Note 8 - Equity Plans (Details) - Restricted Stock Unit Activity - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended
Mar. 01, 2015
Mar. 01, 2014
Jun. 30, 2015
Note 8 - Equity Plans (Details) - Restricted Stock Unit Activity [Line Items]      
Outstanding at     305,357
Outstanding at     $ 22.61
Vested at June 30, 2015     280,915
Vested at June 30, 2015     $ 22.55
Granted 4,639 2,544 69,771
Granted     $ 14.54
Converted into shares     (2,437)
Converted into shares     $ 18.87
Forfeited     0
Forfeited     $ 0