Note 6 - Capital Stock - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jul. 01, 2018 |
Dec. 31, 2017 |
|
| Balance, outstanding options (in shares) | 576,023 | |
| Balance, outstanding weighted average stock price (in dollars per share) | $ 1.13 | |
| Balance, outstanding weighted average remaining contractual term (Year) | 1 year 120 days | 1 year 306 days |
| RSUs granted (in shares) | 25,000 | |
| RSUs granted, weighted average stock price (in dollars per share) | $ 2.37 | |
| RSUs vested and issued in shares (in shares) | (99,748) | |
| RSUs vested and issued in shares, weighted average stock price (in dollars per share) | $ 1.40 | |
| RSUs forfeited (in shares) | (67,689) | |
| RSUs forfeited, weighted average stock price (in dollars per share) | $ 0.97 | |
| Balance, outstanding options (in shares) | 433,586 | 576,023 |
| Balance, outstanding weighted average stock price (in dollars per share) | $ 0.98 | $ 1.13 |
| X | ||||||||||
- Definition Weighted average per share amount of restricted stock units converted into common stock. No definition available.
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| X | ||||||||||
- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares issued during the period as a result of the conversion of convertible securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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