Note 16 - Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allocated Share-based Compensation Expense	$ 2,150	$ 2,469	$ 1,443
Employee Stock Option
Allocated Share-based Compensation Expense	297	475	472
Restricted Stock
Allocated Share-based Compensation Expense	1,619	1,850	857
Employee Stock Purchase Plan
Allocated Share-based Compensation Expense	$ 234	$ 144	$ 114

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

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