Note 8 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Three Percent Of Base Salary [Member]
Defined Benefit Plan Company Contribution Percentage Of A Percentage Of Annual Base Salary	100.00%
Two Percent Of Base Salary [Member]
Defined Benefit Plan Company Contribution Percentage Of A Percentage Of Annual Base Salary	50.00%
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 35,000	$ 42,000	$ 54,000

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration