Note 9 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred compensation plan	$ 6,209	$ 6,357
Derivatives, assets	58	296
Total assets	6,267	6,653
Derivatives, liabilities	(8)
Financial assets:
Deferred compensation plan	6,209	6,357
Derivatives, assets	58	296
Total assets	6,267	6,653
Financial liabilities:
Contingent consideration		(2,974)
Fair Value, Inputs, Level 1 [Member]
Deferred compensation plan	5,215	5,075
Derivatives, assets
Total assets	5,215	5,075
Derivatives, liabilities
Financial assets:
Deferred compensation plan	5,215	5,075
Derivatives, assets
Total assets	5,215	5,075
Financial liabilities:
Contingent consideration
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan	994	1,282
Derivatives, assets	58	296
Total assets	1,052	1,578
Derivatives, liabilities	(8)
Financial assets:
Deferred compensation plan	994	1,282
Derivatives, assets	58	296
Total assets	1,052	1,578
Financial liabilities:
Contingent consideration
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan
Derivatives, assets
Total assets
Derivatives, liabilities
Financial assets:
Deferred compensation plan
Derivatives, assets
Total assets
Financial liabilities:
Contingent consideration		$ (2,974)