Note 10 - Fair Value Measurements (Details) - Discounted Cash Flow Assumptions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Note 10 - Fair Value Measurements (Details) - Discounted Cash Flow Assumptions [Line Items]
Time-to-liquidity (months)	24	24
Expected return	2.50%	2.90%
Minimum [Member]
Note 10 - Fair Value Measurements (Details) - Discounted Cash Flow Assumptions [Line Items]
Discount rate	3.90%	4.00%
Maximum [Member]
Note 10 - Fair Value Measurements (Details) - Discounted Cash Flow Assumptions [Line Items]
Discount rate	6.90%	7.00%