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Note 9 - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member]
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Outstanding at December 31, 2015 (in shares) | shares 79,440
Outstanding at December 31, 2015 (in dollars per share) | $ / shares $ 21.64
Granted (in shares) | shares 10,150
Granted (in dollars per share) | $ / shares $ 19.88
Forfeited (in shares) | shares
Forfeited (in dollars per share) | $ / shares
Distributions (in shares) | shares (1,362)
Distributions (in dollars per share) | $ / shares $ 20.28
Outstanding at March 31, 2016 (in shares) | shares 88,228
Outstanding at March 31, 2016 (in dollars per share) | $ / shares $ 21.62
Vested at March 31, 2016 (in shares) | shares 87,826
Vested at March 31, 2016 (in dollars per share) | $ / shares $ 21.62