Note 7 - Capital Stock (Details Textual) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Apr. 01, 2018 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | 0 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | |
| Share-based Payment Arrangement, Option [Member] | ||
| Share-based Payment Arrangement, Expense | $ 22 | $ 25 |
| Restricted Stock Units (RSUs) [Member] | ||
| Share-based Payment Arrangement, Expense | $ 66 | $ 101 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 0 | |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| 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
|
| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|