Note 6 - Capital Stock - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares |
3 Months Ended | 12 Months Ended |
|---|---|---|
Apr. 01, 2018 |
Dec. 31, 2017 |
|
| Balance, outstanding RSU (in shares) | 576,023 | |
| Balance, outstanding RSU, weighted average stock price (in dollars per share) | $ 1.13 | |
| Balance, outstanding RSU, weighted average remaining contractual term (Year) | 1 year 178 days | 1 year 306 days |
| RSU vested and issued in common shares (in shares) | (99,746) | |
| RSU vested and issued in common shares, weighted average stock price (in dollars per share) | $ 1.40 | |
| RSU forfeited (in shares) | (25,376) | |
| RSU forfeited, weighted average stock price (in dollars per share) | $ 1.33 | |
| Balance, outstanding RSU (in shares) | 450,901 | 576,023 |
| Balance, outstanding RSU, weighted average stock price (in dollars per share) | $ 0.93 | $ 1.13 |
| 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 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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. 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 | ||||||||||
- Details
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