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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Retained Earnings (Accumulated Deficit), Ending Balance | $ (113,216,000) |  | $ (111,421,000) | $ (111,591,000)
Revenue from Contract with Customer, Including Assessed Tax | $ 19,942,000 | $ 18,185,000 |  |
Earnings Per Share, Basic, Total | $ (0.09) | $ (0.16) |  |
Operating Income (Loss), Total | $ (1,626,000) | $ (4,977,000) |  |
Other Nonoperating Income (Expense), Total | (84,000) | (1,848,000) |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | 276,000 |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 507,000 |  |  |
Earnings Per Share, Basic, Total | $ 0.01 |  |  |
Operating Income (Loss), Total | $ 106,000 |  |  |
Other Nonoperating Income (Expense), Total | 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 Operating Results | (106,000) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ (106,000) |  |  |
Accounting Standards Update 2017-07 [Member] |  |  |  |
Operating Income (Loss), Total |  | 156,000 |  |
Other Nonoperating Income (Expense), Total |  | $ (156,000) |  |

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