Note 12 - Employee Benefit Plans (Detail) - Deferred Compensation Agreements (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance, beginning	$ 4,202,733	$ 3,469,525	$ 2,734,989
Balance, ending	5,151,630	4,202,733	3,469,525
Company expense	555,407	414,478	369,950
Employee deferrals	405,788	381,616	371,374
Cash payments made	$ (12,298)	$ (62,886)	$ (6,788)

The increase (decrease) during the reporting period in the obligation created by employee agreements whereby earned compensation will be paid in the future.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInDeferredCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration