Note 14 - Contingencies (Details Textual)	1 Months Ended
Apr. 30, 2016 USD ($)
Putative Class Action Lawsuit [Member]
Litigation Settlement, Amount Awarded to Other Party	$ 650,000

Amount awarded to other party in judgment or settlement of litigation.

No definition available.

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