Note 20 - Segment Information (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Note 20 - Segment Information (Details) [Line Items]
Number of Operating Segments	2us-gaap_NumberOfOperatingSegments
Concentration Risk, Percentage		3.00%us-gaap_ConcentrationRiskPercentage1
Revenues	$ 354,776,000us-gaap_Revenues	$ 310,714,000us-gaap_Revenues
Industrial Group [Member] \| Sales Revenue, Segment [Member]
Note 20 - Segment Information (Details) [Line Items]
Concentration Risk, Percentage	85.00%	82.00%
Industrial Group [Member]
Note 20 - Segment Information (Details) [Line Items]
Revenues	322,262,000	276,136,000
Electronics Group [Member] \| Sales Revenue, Segment [Member]
Note 20 - Segment Information (Details) [Line Items]
Concentration Risk, Percentage	6.00%	7.00%
Electronics Group [Member]
Note 20 - Segment Information (Details) [Line Items]
Revenues	32,514,000	34,578,000
International Operation [Member]
Note 20 - Segment Information (Details) [Line Items]
Export Sales	58,498,000	45,163,000
Revenues	111,177,000	95,392,000
Long-Lived Assets	13,033,000	16,656,000
Net Assets	$ 20,388,000	$ 20,779,000

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Amount of net assets (liabilities).

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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.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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