Note 7 - Litigation (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Proceeds from Legal Settlements	$ 0.3	$ 0.9
Attorney Fees [Member] | Gross [Member]
Gain Contingency, Unrecorded Amount	9.1	9.1
Taxable Costs [Member] | Gross [Member]
Gain Contingency, Unrecorded Amount	0.3	0.3
Gross [Member]
Proceeds from Legal Settlements		2.0
Quarterly [Member]
Proceeds from Legal Settlements		0.3
Attorney Fees [Member]
Gain Contingency, Unrecorded Amount	2.3	2.3
Additional Attorney Fees Sought [Member]
Gain Contingency, Unrecorded Amount	$ 0.2	$ 0.2