Note 1 - Business and Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Other Noncurrent Liabilities [Member]
Deferred Revenue, Noncurrent	$ 300,000	$ 300,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Three Customers [Member]
Concentration Risk, Percentage	66.00%	80.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Three Customers [Member]
Concentration Risk, Percentage	72.00%	79.00%
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Loss Contingency Accrual	0
Deferred Pre-contract Costs	$ 0	100,000
Impairment of Deferred Costs		$ 1,892,000
Number of Impaired Contracts		2
Unbilled Receivables, Current	$ 11,500,000	$ 9,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years

Deferred cost incurred for specific anticipated contracts.

No definition available.

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- Definition

Represents the impairment of deferred costs related to design-to-silicon-yield solutions. This may include, for example, deferred pre-contract costs as it is determined that the costs are no longer recoverable.

+ References

No definition available.

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- Definition

The number of contracts that were impaired during the period.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss contingency liability.

+ References

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-Name Accounting Standards Codification
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

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