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Note 2 - Supplemental Balance-sheet Information (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Amortization of Intangible Assets | $ 143,000 | $ 137,000
Depreciation, Depletion and Amortization, Nonproduction | 300,000 | $ 400,000
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 18,000 |
Customer-Related Intangible Assets [Member] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 91,000 |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 35,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 91,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 91,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 91,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 91,000 |
Trade Names [Member] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Six | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Seven | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Eight | 6,000 |
Finite-Lived Intangible Assets, Amortization Expense, Year Nine | $ 6,000 |

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the eighth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the ninth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the seventh fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the sixth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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