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Note 5 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Deferred compensation plan	$ 4,427,000	$ 4,717,000
Foreign currency forward contracts	37,000
Total financial assets	4,464,000
Foreign currency forward contracts	(508,000)	(1,150)
Fair Value, Inputs, Level 1 [Member]
Deferred compensation plan	3,733,000	3,884,000
Foreign currency forward contracts	0
Total financial assets	3,733,000
Foreign currency forward contracts	0	0
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan	694,000	833,000
Foreign currency forward contracts	37,000
Total financial assets	731,000
Foreign currency forward contracts	(508,000)	(1,150)
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan	0	0
Foreign currency forward contracts	0
Total financial assets	0
Foreign currency forward contracts	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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