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Note 2 - Recently Issued and Adopted Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019
Retained Earnings (Accumulated Deficit), Ending Balance	$ 422,846		$ 594,353	$ 619,690
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 1,900
Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance		$ (500)

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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