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Note 6 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 08, 2019	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		502,213
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		2,300,000
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year (in shares)		200,000
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance (in shares)		0	0
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)		817
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)		$ 12.91
Payment, Tax Withholding, Share-based Payment Arrangement		$ 6	$ 668
Salaries Wages And Related Expenses [Member]
Share-based Payment Arrangement, Expense		$ 500	$ 1,300

X

- Definition

The maximum number of shares of the Class A common stock that can be awarded to a participant in the incentive plan in any calendar-year.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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-Publisher FASB
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Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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