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Note 2 - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Property, plant and equipment	$ 113,935		$ 107,743	$ 106,716
Less accumulated depreciation and amortization	(55,148)		(53,612)	(53,064)
Net property, plant and equipment	58,787		54,131	53,652
Deferred revenue	3,130		871	297
Retained earnings	99,244		97,467	97,562
Net sales	42,931	$ 37,053
Cost of sales	32,746	27,537
Gross profit	10,185	$ 9,516
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Property, plant and equipment	112,831			106,716
Less accumulated depreciation and amortization	(54,474)			(53,064)
Net property, plant and equipment	58,357			53,652
Deferred revenue	2,613			297
Retained earnings	99,331			$ 97,562
Net sales	42,874
Cost of sales	32,697
Gross profit	10,177
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Property, plant and equipment	1,104		1,027
Less accumulated depreciation and amortization	(674)		(548)
Net property, plant and equipment	430		479
Deferred revenue	517		574
Retained earnings	(87)		$ (95)
Net sales	57
Cost of sales	49
Gross profit	$ 8

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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