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Note 9 - Stock-based Compensation (Details) - Phantom Stock Plan - Jun. 30, 2015 - Phantom Stock Plan [Member] - $ / shares
Total
Note 9 - Stock-based Compensation (Details) - Phantom Stock Plan [Line Items]  
Shares 67,113
Fair Value $ 20.27
Vested at June 30, 2015 78,119
Vested at June 30, 2015 $ 21.01
Granted 11,729
Granted $ 19.28
Forfeited (2)
Forfeited $ 20.58
Distributions (451)
Distributions $ 19.64
Shares 78,389
Fair Value $ 21.01