Note 9 - Defined Contribution Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 9 - Defined Contribution Plan (Details) [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 211,000	$ 184,000	$ 146,000
Maximum [Member]
Note 9 - Defined Contribution Plan (Details) [Line Items]
Defined Contribution Plan, Maximum Percentage of Employee Voluntary Contribution	100.00%