Note 9 - Pension Plan (Details Textual)	12 Months Ended
Dec. 31, 2015 USD ($)
Equity Securities [Member]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 77,400

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration