Note 8 - Investment in Limited Partnership (Details Textual) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Partnership Interest [Member]
Noncontrolling Interest, Ownership Percentage by Parent	99.90%
Maximum [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 0.1	$ 0.1

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant