Note 9 - Defined Benefit Plans (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2015
Note 9 - Defined Benefit Plans (Details) [Line Items]
Pension and Other Postretirement Benefit Contributions	$ 31,000
Scenario, Forecast [Member]
Note 9 - Defined Benefit Plans (Details) [Line Items]
Pension and Other Postretirement Benefit Contributions		$ 65,000

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit 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_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration