Note 11 - Accrued Pension Liabilities (Details) - Assumptions Used in the Measurement of the Pension Expense and Benefit Obligations	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted-average assumptions
Discount rate	2.50%	2.10%	3.50%
Expected return on plan assets	4.28%	2.86%	2.88%
Rate of compensation increase	2.50%	2.50%	2.50%