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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Jan. 01, 2018	Dec. 31, 2017
Retained Earnings (Accumulated Deficit), Ending Balance	$ (112,402,000)		$ (112,402,000)		$ (111,421,000)	$ (111,591,000)
Revenue from Contract with Customer, Including Assessed Tax	$ 22,971,000	$ 21,249,000	$ 42,913,000	$ 39,434,000
Earnings Per Share, Basic, Total	$ 0.04	$ (0.15)	$ (0.05)	$ (0.32)
Operating Income (Loss), Total	$ (542,000)	$ (2,847,000)	$ (2,168,000)	$ (7,824,000)
Other Nonoperating Income (Expense), Total	1,623,000	(70,000)	1,707,000	1,778,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance	356,000		356,000
Revenue from Contract with Customer, Including Assessed Tax	$ 519,000		$ 1,026,000
Earnings Per Share, Basic, Total	$ 0.01		$ 0.01
Operating Income (Loss), Total	$ 80,000		$ 186,000
Other Nonoperating Income (Expense), Total	0		0
Accounting Standards Update 2014-09 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance					$ 170,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 80,000		$ 186,000
Accounting Standards Update 2017-07 [Member]
Operating Income (Loss), Total				199,000
Other Nonoperating Income (Expense), Total		$ 43,000		$ 199,000

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