Note 11 - Financial Instruments (Details) £ in Millions, AUD in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 GBP (£)	Jun. 30, 2013 AUD	Dec. 31, 2012 USD ($)
Note 11 - Financial Instruments (Details) [Line Items]
Derivative, Fixed Interest Rate						4.36%
Derivative, Notional Amount						$ 4,800,000
Derivative, Amount of Hedged Item	$ 35,000,000			£ 40.0	AUD 60.0
Proceeds from Hedge, Investing Activities	7,698,000	$ 4,006,000	$ 1,421,000
Derivative Liability	367,000
Other Current Liabilities [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Derivative Liability	1,200,000
Other Current Assets [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Derivative Liability	848,000
Forward Contracts [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Proceeds from Hedge, Investing Activities	$ 7,700,000	$ 4,000,000	1,400,000
Interest Expense [Member]
Note 11 - Financial Instruments (Details) [Line Items]
Unrealized Gain (Loss) on Derivatives			$ 101,000