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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Tax Adjustments, Settlements, and Unusual Provisions			$ 1.2
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			1.0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 0.2
Effective Income Tax Rate Reconciliation, Percent, Total	25.20%	37.90%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	28.30%	41.60%
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	26.50%	26.50%
Foreign Tax Authority [Member] | Ministry of Finance, Republic of Serbia [Member]
Effective Income Tax Rate Reconciliation, Percent, Total	17.30%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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