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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Payment Arrangement, Expense	$ 1,442	$ 2,154	$ 2,993	$ 3,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)	0		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	1,355,786		1,355,786		1,382,986
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 100	300	$ 200	500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	500		$ 500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			1 year 7 months 6 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	$ 1,900	$ 2,800	$ 2,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 9,100		$ 9,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 4 months 24 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		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