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Note 2 - Recently Issued Accounting Standards (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Income (Loss), Total	$ 11,850,000	$ 8,658,000
Cost of Goods and Services Sold, Total	70,398,000	70,351,000
Selling, General and Administrative Expense, Total	14,356,000	13,594,000
Other Nonoperating Income (Expense), Total	806,000	(1,338,000)
Accounting Standards Update 2017-07 [Member]
Operating Income (Loss), Total	(59,000)	1,700,000
Cost of Goods and Services Sold, Total		(1,100,000)
Selling, General and Administrative Expense, Total		(600,000)
Other Nonoperating Income (Expense), Total		$ (1,700,000)
Reclassification of Pension Settlement Charge from Operating Income [Member] | Three Months Ended March 31, 2017 [Member]
Prior Period Reclassification Adjustment	$ 1,700,000

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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