Note 13 - Acquisition (Details Textual)		3 Months Ended
Feb. 01, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Business Combination, Acquisition Related Costs		$ 1,069,000
Revenue from Contract with Customer, Including Assessed Tax		42,931,000	37,053,000
Net Income (Loss) Attributable to Parent, Total		1,777,000	$ 2,171,000
Dielectrics [Member]
Lessee, Operating Lease, Term of Contract	5 years
Number of Lease Term Options	2
Dielectrics [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Payments to Acquire Businesses, Gross	$ 80,000,000
Business Combination, Consideration Transferred, Working Capital Adjustment	$ 250,000
Business Combination, Acquisition Related Costs		1,100,000
Revenue from Contract with Customer, Including Assessed Tax		6,000,000
Net Income (Loss) Attributable to Parent, Total		$ 1,100,000

The amount of adjustment to working capital in a business combination.

No definition available.

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- Definition

Represents the number of lease term options.

+ References

No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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