Note 4 - Interim Consolidated Financial Statement Details (Details Textual) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Apr. 01, 2018 |
Apr. 02, 2017 |
Dec. 31, 2017 |
|
| Depreciation, Total | $ 774,000 | $ 979,000 | |
| Property, Plant and Equipment, Net, Ending Balance | 9,592,000 | $ 10,269,000 | |
| Machinery and Equipment [Member] | |||
| Capital Leased Assets, Gross, Total | 533,000 | 533,000 | |
| Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 237,000 | $ 222,000 | |
| Machinery and Equipment [Member] | CHINA | |||
| Property, Plant and Equipment, Net, Ending Balance | 1,262,000 | ||
| Long-lived Assets, Amount in Excess of Carrying Value | 1,056,000 | ||
| Impairment of Long-Lived Assets Held-for-use | 0 | ||
| Long-lived Assets, Fair Value Assumption, Revenue Projection Decreased by Ten Percent, Recoverable Amount | 731 | ||
| Machinery and Equipment [Member] | Assets Under Capital Lease [Member] | |||
| Depreciation, Total | $ 15,000 | $ 78,000 | |
| X | ||||||||||
- Definition The recoverable amount of long-lived assets in case the revenue projections are decreased by 10%. No definition available.
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| X | ||||||||||
- Definition The difference amount between fair value and carrying value of long-lived assets. No definition available.
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| X | ||||||||||
- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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