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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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