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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2014
Cash, Uninsured Amount | $ 24,100,000 |  |  |
Research and Development Expense | $ 1,100,000 | $ 1,300,000 | $ 1,300,000 |
Treasury Stock, Shares, Acquired | 0 | 0 |  |
Increase (Decrease) in Accounts Payable | $ 93,000 | $ (683,000) | (1,379,000) |
Payments to Acquire Property, Plant, and Equipment | 10,382,000 | 7,206,000 | 15,742,000 |
Restatement Adjustment [Member] |  |  |  |
Increase (Decrease) in Accounts Payable |  | (87,000) |  |
Payments to Acquire Property, Plant, and Equipment |  |  | (579,000) |
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member] | Tooling Sales [Member] |  |  |  |
Deferred Revenue, Period Increase (Decrease) | 574,000 |  |  |
Property, Plant and Equipment, Gross, Period Increase (Decrease) | 479,000 |  |  |
Increase (Decrease) in Retained Earnings | 95,000 |  |  |
Employee Stock Option [Member] |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 525,000 | $ 318,000 | $ 312,000 |
Minimum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |
Maximum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 14 years |  |  |
Component Products [Member] |  |  |  |
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount |  |  |  | $ 69,000,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  | 74.00%

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