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Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						35.00%
Income Tax Expense (Benefit), Total	$ 86,000	$ 104,000	$ 219,000	$ 370,000
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0			$ 0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total						69,594,000
Tax Credit Carryforward, Amount						1,837,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year			2002
Domestic Tax Authority [Member] | Latest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year			2017
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total						$ 12,760,000
Foreign Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year			2009
Foreign Tax Authority [Member] | Latest Tax Year [Member]
Open Tax Year			2017
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year			2002
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Open Tax Year			2017
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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