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Note 4 - Stock-based Compensation - Activity for Time-based and Performance-based Restricted Stock (Details)
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Restricted Stock [Member]  
Outstanding (in shares) | shares 316,116
Outstanding (in dollars per share) | $ / shares $ 13.30
Granted (in shares) | shares 258,060
Granted (in dollars per share) | $ / shares $ 9.18
Vested (in shares) | shares 178,424
Vested (in dollars per share) | $ / shares $ 12.20
Forfeited (in shares) | shares 33,016
Forfeited (in dollars per share) | $ / shares $ 12.51
Canceled or expired (in shares) | shares
Canceled or expired (in dollars per share) | $ / shares
Outstanding (in shares) | shares 362,736
Outstanding (in dollars per share) | $ / shares $ 10.98
Performance Shares [Member]  
Outstanding (in shares) | shares 241,141
Outstanding (in dollars per share) | $ / shares $ 15.39
Granted (in shares) | shares 83,897
Granted (in dollars per share) | $ / shares $ 8.85
Vested (in shares) | shares 6,472
Vested (in dollars per share) | $ / shares $ 20.54
Forfeited (in shares) | shares 15,247
Forfeited (in dollars per share) | $ / shares $ 14.28
Canceled or expired (in shares) | shares 13,704
Canceled or expired (in dollars per share) | $ / shares $ 13.68
Outstanding (in shares) | shares 289,615
Outstanding (in dollars per share) | $ / shares $ 13.66