Note 14 - Employee Benefit Plans (Details) - Profit Sharing Contributions - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Profit Sharing Contributions [Abstract]
Matching contribution	$ 1,314,276	$ 1,179,979	$ 1,129,726
Discretionary contribution		198,800	186,000
	$ 1,314,276	$ 1,378,779	$ 1,315,726

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

Name:	us-gaap_PensionContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration