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Note 11 - Share-based Compensation - Restricted Stock Units Activity (Details)
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Time-based Restricted Stock Units [Member] | The 2007 and 2014 Plan [Member]  
Outstanding non-vested (in shares) | shares 197,734
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 7.33
Granted (in shares) | shares 40,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 5.05
Vested (in shares) | shares (25,000)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 5.41
Forfeited or expired (in shares) | shares 0
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding non-vested (in shares) | shares 212,734
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 7.12
Performance-based Restricted Stock Units [Member] | The 2014 Plan [Member]  
Outstanding non-vested (in shares) | shares 200,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 5.36
Granted (in shares) | shares 200,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 4.85
Vested (in shares) | shares 0
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Forfeited or expired (in shares) | shares 0
Forfeited or expired, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding non-vested (in shares) | shares 400,000
Outstanding non-vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 5.11