Note 11 - Financial Instruments (Details Textual) £ in Millions, AUD in Millions	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Sep. 30, 2013 GBP (£)	Jun. 30, 2013 AUD
Other Current Liabilities [Member]
Derivative Liability	$ 2,100,000	$ 1,200,000
Other Current Assets [Member]
Derivative Liability		848,000
Derivative, Amount of Hedged Item			£ 35	£ 40	AUD 60
Derivative Liability		$ 367,000