Note 8 - Pension - Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Expected long-term rate of return on plan assets	6.50%
UNITED STATES | Pension Plan [Member]
Expected long-term rate of return on plan assets	6.50%	7.00%
Cash balance interest crediting rate	5.50%	5.50%
Cash balance interest crediting rate	5.50%	5.50%
UNITED STATES | Minimum [Member] | Pension Plan [Member]
Discount rate	4.31%	3.64%
Discount rate	3.45%	4.31%
UNITED STATES | Maximum [Member] | Pension Plan [Member]
Discount rate	4.33%	3.69%
Discount rate	3.50%	4.33%
Foreign Plan [Member] | Pension Plan [Member]
Discount rate	10.06%	9.40%
Rate of compensation increase	4.30%	4.30%
Discount rate	8.80%	10.60%
Rate of compensation increase	4.30%	4.30%