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Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Aug. 26, 2016	May 26, 2019	May 27, 2018	May 28, 2017	May 29, 2016	May 30, 2016	May 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			29.35%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017 Provisional Effect on Deferred Tax Assets and Liabilities, Amount			$ 16,200,000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 1,800,000
Effective Income Tax Rate Reconciliation, Percent, Total			64.00%	29.00%
Excess Tax Deficiencies from Share-based Compensation			$ 38,000
Additional Paid in Capital, Ending Balance			142,087,000	$ 141,680,000
Retained Earnings (Accumulated Deficit), Ending Balance			109,299,000	84,470,000
Deferred Tax Liabilities, Net, Total			23,230,000	33,007,000
Deferred Tax Assets, Valuation Allowance, Total			1,337,000	1,325,000
Unrecognized Tax Benefits, Ending Balance			479,000	$ 537,000	$ 842,000		$ 987,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			372,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible			25,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total			7,100,000
Tax Credit Carryforward, Amount			400,000
Domestic Tax Authority [Member] | Indiana [Member]
Operating Loss Carryforwards, Total			5,600,000
Domestic Tax Authority [Member] | Other States, Tax Board [Member]
Operating Loss Carryforwards, Total			3,100,000
State and Local Jurisdiction [Member] | California [Member]
Tax Credit Carryforward, Amount			1,500,000
State and Local Jurisdiction [Member] | Minnesota [Member]
Tax Credit Carryforward, Amount			$ 700,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 423,000
Accounting Standards Update 2016-09 [Member]
Additional Paid in Capital, Ending Balance						$ 200,000
Retained Earnings (Accumulated Deficit), Ending Balance						(126,000)
Deferred Tax Liabilities, Net, Total						(74,000)
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 549,000
Excess Tax Benefits From Stock-based Compensation Reclassified From Financing Activities to Operating Activities [Member] | Fiscal Year Ended May 29, 2016 [Member]
Prior Period Reclassification Adjustment	$ 150,000
Excess Tax Benefits From Stock-based Compensation Reclassified From Financing Activities to Operating Activities [Member] | Fiscal Year Ended May 31, 2015 [Member]
Prior Period Reclassification Adjustment	$ 463,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%

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