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Note 11 - Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member]
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Outstanding, beginning balance (in shares) | shares 89,339
Outstanding, beginning balance (in dollars per share) | $ / shares $ 29.39
Granted (in shares) | shares 8,469
Granted (in dollars per share) | $ / shares $ 27.43
Forfeited (in shares) | shares (10)
Forfeited (in dollars per share) | $ / shares $ 28.95
Distributions (in shares) | shares (8,618)
Distributions (in dollars per share) | $ / shares $ 28.72
Outstanding, ending balance (in shares) | shares 89,180
Outstanding, ending (in dollars per share) | $ / shares $ 27.50
Vested at December 31, 2017 (in shares) | shares 88,895
Vested at December 31, 2017 (in dollars per share) | $ / shares $ 27.50