Note 2 - Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total			$ 800
Foreign Currency Transaction Gain (Loss), Realized			$ 319	$ (701)
Stock Options and Restricted and Deferred Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			449,156	498,315
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ 300	$ 100	$ (300)	$ (700)

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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