Note 12 - Income Taxes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal Taxable Income	$ 35,300,000	$ 18,700,000	$ 5,200,000
Operating Loss Carryforwards		4,600,000
Operating Loss Carryfoward Used to Offset Current Year Taxable Income	4,600,000	18,700,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	7,900,000
Increase (Decrease) in Income Taxes Payable	2,900,000
Unrecognized Tax Benefits	327,000	308,000	176,000
Unrecognized Tax Benefits, Period Increase (Decrease)	19,000	132,000
United Kingdom [Member] | Foreign Tax Credit [Member]
Tax Credit Carryforward, Amount	2,500,000
Australia [Member] | Foreign Tax Credit [Member]
Tax Credit Carryforward, Amount	3,400,000
MES Group [Member]
Operating Loss Carryforwards		23,300,000
Alternative Minimum Tax [Member]
Tax Credit Carryforward, Amount	171,000	171,000
Foreign Tax Credit [Member]
Tax Credit Carryforward, Amount		$ 894,000