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Note 7 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 29, 2019
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | Three-month period ended |  |  | Nine -month period ended |
|  | September 29 , |  |  | September 30 , |  |  | September 29 , |  |  | September 30 , |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 117 |  |  | $ | 344 |  |  | $ | 433 |  |  | $ | 653 |
Restricted stock grants |  |  | 42 |  |  |  | 19 |  |  |  | 86 |  |  |  | 54 |
Total |  | $ | 159 |  |  | $ | 363 |  |  | $ | 519 |  |  | $ | 707 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2019 |  |  | 1,576,087 |  |  | $ | 6.58 |  |  |  |  |  |  |  |  |
Granted |  |  | 282,500 |  |  |  | 8.27 |  |  |  |  |  |  |  |  |
Exercised |  |  | (194,720 | ) |  |  | 4.45 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (46,082 | ) |  |  | 7.04 |  |  |  |  |  |  |  |  |
Outstanding at September 29, 2019 |  |  | 1,617,785 |  |  | $ | 7.12 |  |  |  | 3.38 |  |  | $ | 3,192 |
Vested and expected to vest at September 29, 2019 |  |  | 1,518,161 |  |  | $ | 7.05 |  |  |  | 3.21 |  |  | $ | 3,113 |
Exercisable at September 29, 2019 |  |  | 1,095,661 |  |  | $ | 6.29 |  |  |  | 2.31 |  |  | $ | 2,870 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-Free Interest Rate |  |  | 1.8 | %
Volatility Factor |  |  | 48 | %
Weighted Average Expected Life (Years) |  |  | 5.3 |
Dividends |  |  | 0.0 | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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