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Note 6 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
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 30, |  |  | September 29, |  |  | September 30, |  |  | September 29, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock options |  | $ | 204 |  |  | $ | 117 |  |  | $ | 674 |  |  | $ | 433 |
Restricted stock grants |  |  | 18 |  |  |  | 42 |  |  |  | 82 |  |  |  | 86 |
Total |  | $ | 222 |  |  | $ | 159 |  |  | $ | 756 |  |  | $ | 519 |
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, 2020 |  |  | 1,541,792 |  |  | $ | 6.88 |  |  |  |  |  |  |  |  |
Granted |  |  | 256,000 |  |  |  | 6.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (50,797 | ) |  |  | 4.29 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (17,584 | ) |  |  | 7.72 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2020 |  |  | 1,729,411 |  |  | $ | 6.89 |  |  |  | 3.06 |  |  | $ | 745 |
Vested and expected to vest at September 30, 2020 |  |  | 1,626,494 |  |  | $ | 6.84 |  |  |  | 2.88 |  |  | $ | 745 |
Exercisable at September 30, 2020 |  |  | 1,244,119 |  |  | $ | 6.63 |  |  |  | 1.92 |  |  | $ | 745 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-Free Interest Rate |  |  | 0.4 | %
Volatility Factor |  |  | 49 | %
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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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