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Note 9 - Stock-based Compensation (Tables) | 12 Months Ended
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Sep. 28, 2019
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended |
|  | Septem ber 28 , |  |  | Septem ber 29 , |  |  | Septem ber 30 , |
|  | 201 9 |  |  | 201 8 |  |  | 201 7 |
Expected term (in years) |  |  | 4.59 |  |  |  | 4.79 |  |  |  | 5.14 |
Risk-free interest rate |  |  | 2.03 | % |  |  | 2.71 | % |  |  | 1.98 | %
Expected volatility |  |  | 42.79 | % |  |  | 37.32 | % |  |  | 38.32 | %
Expected dividend yield |  |  | 0.56 | % |  |  | 0.37 | % |  |  | 0.37 | %
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  | Contractual |  |  |
|  |  |  |  |  | Exercise Price |  | Term - |  | Aggregate |
|  |  |  |  |  | Per Share |  | Weighted |  | Intrinsic |
|  | Options |  |  |  |  |  |  |  |  | Weighted |  | Average |  | Value |
(Share amounts in thousands) |  | Outstanding |  |  | Range |  |  | Average |  | (in years) |  | (in thousands) |
Outstanding at October 1, 2016 |  |  | 371 |  |  |  | $9.16 | - | $34.49 |  |  | $ | 20.81 |  |  |  |  |  |
Granted |  |  | 88 |  |  |  | 26.75 | - | 37.06 |  |  |  | 30.93 |  |  |  |  |  |
Exercised |  |  | (67 | ) |  |  | 9.16 | - | 23.95 |  |  |  | 19.05 |  |  |  | $ | 1,212 |
Outstanding at September 30, 2017 |  |  | 392 |  |  |  | 9.16 | - | 37.06 |  |  |  | 23.40 |  |  |  |  |  |
Granted |  |  | 77 |  |  |  | 29.69 | - | 41.85 |  |  |  | 34.84 |  |  |  |  |  |
Exercised |  |  | (196 | ) |  |  | 9.16 | - | 37.06 |  |  |  | 19.68 |  |  |  |  | 3,866 |
Forfeited |  |  | (9 | ) |  |  | 23.95 | - | 37.06 |  |  |  | 29.88 |  |  |  |  |  |
Outstanding at September 29, 2018 |  |  | 264 |  |  |  | 10.23 | - | 41.85 |  |  |  | 29.25 |  |  |  |  |  |
Granted |  |  | 129 |  |  |  | 18.25 | - | 21.57 |  |  |  | 19.74 |  |  |  |  |  |
Exercised |  |  | (5 | ) |  |  | 18.05 | - | 26.75 |  |  |  | 23.95 |  |  |  |  | 21 |
Outstanding at September 28, 2019 |  |  | 388 |  |  |  | 10.23 | - | 41.85 |  |  |  | 26.16 |  | 7.81 |  |  | 370 |
Vested and anticipated to vest in the future at September 28, 2019 |  |  | 384 |  |  |  |  |  |  |  |  |  | 26.17 |  | 7.79 |  |  | 366 |
Exercisable at September 28, 2019 |  |  | 184 |  |  |  |  |  |  |  |  |  | 27.62 |  | 6.31 |  |  | 195 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Restricted |  |  | Average |
|  | Stock Units |  |  | Grant Date |
(Unit amounts in thousands) |  | Outstanding |  |  | Fair Value |
Balance, October 1, 2016 |  |  | 145 |  |  | $ | 22.35 |
Granted |  |  | 37 |  |  |  | 31.95 |
Released |  |  | (54 | ) |  |  | 20.43 |
Balance, September 30, 2017 |  |  | 128 |  |  |  | 25.92 |
Granted |  |  | 35 |  |  |  | 33.52 |
Forfeited |  |  | (3 | ) |  |  | 29.60 |
Released |  |  | (57 | ) |  |  | 22.26 |
Balance, September 29, 2018 |  |  | 103 |  |  |  | 30.40 |
Granted |  |  | 61 |  |  |  | 20.18 |
Released |  |  | (49 | ) |  |  | 27.64 |
Balance, September 28, 2019 |  |  | 115 |  |  |  | 26.16 |
Restricted Stock Units (RSUs) [Member] |
Notes Tables |
Share-based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Year Ended |
|  | September 28, |  |  | September 29, |  |  | September 30, |
(In thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Restricted stock unit grants: |  |  |  |  |  |  |  |  |  |  |  |
Units |  |  | 61 |  |  |  | 35 |  |  |  | 37 |
Market value |  | $ | 1,225 |  |  | $ | 1,175 |  |  | $ | 1,180 |
Compensation expense |  |  | 1,168 |  |  |  | 1,172 |  |  |  | 1,238 |

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