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Note 5 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017	May 11, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 146 days
Minimum [Member]
Performance-based Shares, Payout Opportunity, Percentage	25.00%
Maximum [Member]
Performance-based Shares, Payout Opportunity, Percentage	200.00%
Options and Restricted Stock [Member]
Allocated Share-based Compensation Expense, Total		$ 0.9	$ 0.8	$ 2.6	$ 2.8
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 3.9		3.9
Time-based and Performance-based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 2.2	$ 2.3
Performance Shares [Member] | Vesting at End of Three-year Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period	3 years
The 2017 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						1,000,000

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- Definition

The percentage of payout from performance based shares.

+ References

No definition available.

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- Definition

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

+ References

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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