Note 11 - Accrued Expenses (Details Textual) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Management Incentive Plans [Member]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount	$ 214,000	$ 214,000

Amount of commitment made to pay deferred cash remuneration.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant