Note 16 - Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allocated Share-based Compensation Expense	$ 2,469	$ 1,443	$ 1,187
Employee Stock Option
Allocated Share-based Compensation Expense	475	472	554
Restricted Stock
Allocated Share-based Compensation Expense	1,850	857	553
Employee Stock Purchase Plan
Allocated Share-based Compensation Expense	$ 144	$ 114	$ 80

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

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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