Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Aug. 20, 2015 shares
New ESPP [Member]
Common Stock, Capital Shares Reserved for Future Issuance	3,500,000
The 2015 Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	3,000,000
Prior Plans [Member]
Common Stock, Capital Shares Reserved for Future Issuance	5,000,000