Represents the minimum consolidated leverage ratio of credit facility.

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Note 9 - Stockholders' Equity and Equity Compensation (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 shares	Apr. 30, 2019 shares	Dec. 31, 2018 shares	Apr. 30, 2018 shares
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 16.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 3 months 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)		52,783
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) \| $ / shares		$ 18.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	0		0
A 2016 Employee Plan [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)						1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,598,572
A 2016 Director Plan [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)				300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	319,168
Share-based Payment Arrangement, Option [Member]
Stock Repurchased During Period, Shares (in shares)		48,409
Stock Repurchased During Period, Value \| $		$ 1.0
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) \| $ / shares		$ 20.52
Share-based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	7 years
Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Current Stock Awards [Member]
Share-based Payment Arrangement, Expense \| $	$ 1.8	$ 2.0
Deferred Stock Units [Member]
Share-based Payment Arrangement, Expense \| $	0.3	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 month 6 days
Amended Credit Facility [Member]
Stock Repurchase Program, Authorized Amount \| $	$ 40.0
Credit Facility Minimum Consolidated Leverage Ratio	2.50
The 2019 Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)			2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	2,000,000
The 2018 Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					2,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	327,161
In Connection With Equity Compensation Programs [Member]
Stock Repurchase Program, Authorized Amount \| $	$ 10.0
Stock Repurchased During Period, Shares (in shares)	80,129	152,946
Stock Repurchased During Period, Value \| $	$ 1.8	$ 3.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) \| $ / shares	$ 22.87	$ 20.48
Through The Open Market Repurchase Program [Member]
Stock Repurchased During Period, Shares (in shares)	180,491	622,043
Stock Repurchased During Period, Value \| $	$ 3.2	$ 11.1
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) \| $ / shares	$ 17.80	$ 17.82