Note 9 - Income Taxes - Deferred Income Tax Liabilities and Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Jan. 01, 2017 |
|---|---|---|
| Deferred income tax assets: | ||
| Net operating loss carryforwards | $ 18,425 | $ 23,844 |
| Capital loss carryforwards | 3,563 | 3,563 |
| Tax credit carryforwards | 3,104 | 3,407 |
| Property, plant and equipment and other assets | 1,529 | 2,015 |
| Reserves, allowances and accruals | 1,441 | 1,301 |
| 28,062 | 34,130 | |
| Valuation allowance | (27,757) | (33,904) |
| Net deferred income tax assets | $ 305 | $ 226 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. No definition available.
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| X | ||||||||||
- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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