Note 9 - Commitments and Contingencies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 4,500,000	$ 3,700,000	$ 8,700,000	$ 7,100,000
Defined Contribution Plan, Cost Recognized	$ 306,000	$ 234,000	$ 676,000	$ 462,000