Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Net number of share options (or share units) granted during the period.

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Note 11 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Payment Arrangement, Expense	$ 1,551	$ 1,196
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	1,363,168		1,382,986
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 100	200
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 700
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 292 days
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Minimum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	20.00%
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Maximum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Restricted Stock [Member]
Share-based Payment Arrangement, Expense	$ 1,400	$ 900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 10,300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Restricted Stock [Member] \| On Each of First Four Anniversaries of Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	595,621
Performance Shares [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Minimum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years