Note 7 - Recent Accounting Standards (Details Textual) - Scenario, Forecast [Member] - Accounting Standards Update 2014-09 [Member]	Jan. 01, 2018 USD ($)
Minimum [Member]
Cumulative Effect on Retained Earnings, Net of Tax	$ 350,000
Maximum [Member]
Cumulative Effect on Retained Earnings, Net of Tax	$ 400,000

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

Name:	us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration