Note 11 - Commitments and Contingencies (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Undisbursed Lines of Credit [Member]
Other Commitment	$ 262.6	$ 251.9
Standby Letters of Credit [Member]
Other Commitment	4.1	3.9
Commercial Letters of Credit [Member]
Other Commitment	$ 4.7	$ 5.6

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant