Note 13 - Commitments and Contingencies (Details Textual) - USD ($)		1 Months Ended	12 Months Ended
	Jun. 09, 2014	Aug. 31, 2011	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Lease Expense Exclusive of Sublease Income [Member]
Operating Leases, Rent Expense			$ 5,400,000	$ 6,900,000	$ 7,600,000
Minimum [Member] | Subsidiaries [Member]
Loss Contingency, Damages Sought, Value		$ 7,000,000
Subsidiaries [Member] | Appeal Filed to Recover Attorney Fees and Costs [Member]
Loss Contingency, Damages Sought, Value			2,300,000
Subsidiaries [Member] | Pending Litigation [Member] | New York Action [Member]
Loss Contingency, Damages Sought, Value			450,000
Subsidiaries [Member] | Surety Bond [Member] | Texas Action [Member]
Restricted Cash and Cash Equivalents			$ 500,000
Subsidiaries [Member] | Surety Bond [Member]
Surety Bond, Amount Required, Percent of Judgment			150.00%
Restricted Cash and Cash Equivalents			$ 2,200,000
Subsidiaries [Member]
Loss Contingency, Damages Awarded, Value	$ 1,380,000
Operating Leases, Rent Expense			15,766,000	16,950,000	18,397,000
Operating Leases, Rent Expense, Sublease Rentals			25,000	$ 42,000	$ 300,000
Loss Contingency Accrual			$ 2,600,000