Note 13 - Stockholders' Equity (Details) - Number of Shares Available for Future Issuance	Dec. 31, 2015 shares
Note 13 - Stockholders' Equity (Details) - Number of Shares Available for Future Issuance [Line Items]
Shares available for future issuance	7,233,000
Equity Awards [Member]
Note 13 - Stockholders' Equity (Details) - Number of Shares Available for Future Issuance [Line Items]
Shares available for future issuance	1,063,000
Preferred Stock [Member]
Note 13 - Stockholders' Equity (Details) - Number of Shares Available for Future Issuance [Line Items]
Shares available for future issuance	5,000,000
1993 Employee Stock Purchase Plan (ESPP) [Member]
Note 13 - Stockholders' Equity (Details) - Number of Shares Available for Future Issuance [Line Items]
Shares available for future issuance	1,170,000