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Note 10 - Equity Plans - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Outstanding beginning balance (in shares) | shares 287,894
Outstanding beginning balance (in dollars per share) | $ / shares $ 22.39
Granted (in shares) | shares 137,935
Granted (in dollars per share) | $ / shares $ 15.19
Converted into shares (in shares) | shares (3,239)
Converted into shares (in dollars per share) | $ / shares $ 19.12
Forfeited (in shares) | shares (1,104)
Forfeited (in dollars per share) | $ / shares $ 18.03
Outstanding ending balance (in shares) | shares 421,486
Outstanding ending balance (in dollars per share) | $ / shares $ 19.92
Vested (in shares) | shares 411,794
Vested (in dollars per share) | $ / shares $ 19.89