Note 10 - Commitments and Contingent Liabilities (Detail) - Commitments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Standby letters of credit	$ 5,959	$ 5,486
Fixed Rate Commitments [Member]
Commitments	678	1,456
Variable Rate Commitments [Member]
Commitments	$ 50,488	$ 54,860

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