Note 13 - Employee Equity Incentive Plans (Details) - Status of Non-vested Shares - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Status of Non-vested Shares [Abstract]
Shares underlying stock options	175,000	250,000
Weighted average grant date fair value	$ 0.22	$ 0.23

Weighted average grant-date fair value of non-vested options outstanding.

No definition available.

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant