Note 11 - Financial Instruments (Detail)					12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 AUD	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Interest Expense [Member] USD ($)	Dec. 31, 2011 Interest Expense [Member] USD ($)	Dec. 31, 2010 Interest Expense [Member] USD ($)
Derivative, Fixed Interest Rate	4.36%	4.36%
Derivative, Notional Amount	$ 4,800,000		$ 6,600,000	$ 8,300,000
Unrealized Gain (Loss) on Derivatives					225,000	328,000	(42,000)
Long-term Debt, Fair Value (in Dollars)		50,000,000