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Note 10 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
 9 Months Ended
Mar. 26, 2019
Sep. 30, 2019
Unvested, number of units (in shares)   3,831,965
Unvested, weighted average grant-date fair value (in dollars per share)   $ 7.95
Granted, number of units (in shares)   2,119,628
Granted, weighted average grant-date fair value (in dollars per share)   $ 4.93
Vested and delivered, number of units (in shares)   (1,490,913)
Vested and delivered, weighted average grant-date fair value (in dollars per share)   $ 4
Withheld as treasury stock, number of units (in shares) [1]   (557,988)
Withheld as treasury stock, weighted average grant-date fair value (in dollars per share) [1]   $ 4.16
Vested not delivered, number of units (in shares) 627,752 112,582 [2]
Vested not delivered, weighted average grant-date fair value (in dollars per share) [2]   $ 4.75
Forfeited, number of units (in shares)   (221,047)
Forfeited, weighted average grant-date fair value (in dollars per share)   $ 3.59
Unvested, number of units (in shares)   3,794,227
Unvested, weighted average grant-date fair value (in dollars per share)   $ 7.66
[1] As discussed in Note 9, the increase in treasury stock was due to shares withheld to cover statutory withholding taxes upon the delivery of shares following vesting of RSUs and issuance of restricted stock. As of September 30, 2019, there were 1,791,186 outstanding shares of treasury stock.
[2] Vested not delivered represents vested RSUs with delivery deferred to a future time. For the nine months ended September 30, 2019, there was a net decrease of 112,582 shares included in vested not delivered as a result of the delivery of Spin-off Grants of 740,334 shares, partially offset by the net activity from vesting of RSUs with deferred delivery of 627,752 shares. As of September 30, 2019, there were 2,797,335 outstanding RSUs included in vested not delivered.