Note 5 - Acquisition (Detail)	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2012 AUD	Sep. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 AUD	Dec. 31, 2011 Post-closing Payments, Related to True-up of Final Working Capital Conveyed [Member] USD ($)	Dec. 31, 2011 Post-closing Payments, Related to True-up of Final Working Capital Conveyed [Member] AUD	Dec. 31, 2011 Post-closing Payments, Related to Six-month Earn-out Provision [Member] USD ($)	Dec. 31, 2011 Post-closing Payments, Related to Six-month Earn-out Provision [Member] AUD
Business Acquisition, Cost of Acquired Entity, Cash Paid					$ 28,800,000	27,200,000
Payments for Previous Acquisition			2,900,000				800,000	800,000	2,100,000	2,000,000
	11,900,000	11,900,000		11,892,000
Liabilities Related To Working Capital And Additional Consideration	$ 14,800,000			$ 14,800,000