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Note 3 - Trade Accounts Receivable - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance—beginning of year	$ 2,952	$ 2,224	$ 1,335
Provision for bad debts	530	728	889
Charge-offs	0	0	0
Recoveries	0	0	0
Balance—end of year	$ 3,482	$ 2,952	$ 2,224

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

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X

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

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X

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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X

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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