Note 4 - Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 4 - Property, Plant and Equipment (Details) [Line Items]
Depreciation	$ 33,200,000	$ 29,400,000	$ 25,700,000
Payments to Acquire Property, Plant, and Equipment	106,973,000	67,929,000	43,955,000
Manufacturing Facility [Member]
Note 4 - Property, Plant and Equipment (Details) [Line Items]
Payments to Acquire Property, Plant, and Equipment	28,800,000
Facility in Fourchon, Louisiana [Member] | Scenario, Plan [Member]
Note 4 - Property, Plant and Equipment (Details) [Line Items]
Payments to Acquire Property, Plant, and Equipment	30,000,000
Facility in Conroe, Texas [Member] | Scenario, Plan [Member]
Note 4 - Property, Plant and Equipment (Details) [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 20,000,000