Note 14 - Financial Derivatives (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Positive Fair Value Member
Notional Amount Of Option Contract	$ 1,600,000	$ 209,000
Open Option Contracts Written, at Fair Value	5,700	2,000
Sum of Spot and Forward Contract Notional Amount	211,700,000	188,100,000
Increase Decrease in Fair Value	3,000,000	2,900,000
Negative Fair Value Member
Sum of Spot and Forward Contract Notional Amount	165,600,000	133,700,000
Increase Decrease in Fair Value	$ 1,900,000	$ 1,600,000