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Note 3 - Recent Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Inventory, net | $ 16,579,000 |  | $ 16,986,000 | $ 17,641,000
Contract assets | 1,331,000 |  | 825,000 | 0
Accumulated deficit | (113,216,000) |  | (111,421,000) | $ (111,591,000)
Net revenue | 19,942,000 | $ 18,185,000 |  |
Cost of sales | 17,911,000 | 18,732,000 |  |
Gross profit | 2,031,000 | (547,000) |  |
Selling, general and administrative | 3,148,000 | 3,410,000 |  |
Severance, equipment relocation and other costs | 509,000 | 998,000 |  |
Operating loss | (1,626,000) | (4,977,000) |  |
Interest expense, net | 213,000 | 188,000 |  |
Other (income), net | (84,000) | (1,848,000) |  |
Loss before taxes | (1,755,000) | (3,317,000) |  |
Income tax expense | 40,000 | (9,000) |  |
Net loss | (1,795,000) | $ (3,308,000) |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |
Inventory, net |  |  | (655,000) |
Contract assets |  |  | 825,000 |
Accumulated deficit |  |  | $ 170,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Inventory, net | 1,055,000 |  |  |
Contract assets | 1,331,000 |  |  |
Accumulated deficit | 276,000 |  |  |
Net revenue | 507,000 |  |  |
Cost of sales | 401,000 |  |  |
Gross profit | 106,000 |  |  |
Selling, general and administrative | 0 |  |  |
Severance, equipment relocation and other costs | 0 |  |  |
Operating loss | 106,000 |  |  |
Interest expense, net | 0 |  |  |
Other (income), net | 0 |  |  |
Loss before taxes | 106,000 |  |  |
Income tax expense | 0 |  |  |
Net loss | 106,000 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Inventory, net | 17,634,000 |  |  |
Contract assets | 0 |  |  |
Accumulated deficit | (113,492,000) |  |  |
Net revenue | 19,435,000 |  |  |
Cost of sales | 17,510,000 |  |  |
Gross profit | 1,925,000 |  |  |
Selling, general and administrative | 3,148,000 |  |  |
Severance, equipment relocation and other costs | 509,000 |  |  |
Operating loss | (1,732,000) |  |  |
Interest expense, net | 213,000 |  |  |
Other (income), net | (84,000) |  |  |
Loss before taxes | (1,861,000) |  |  |
Income tax expense | 40,000 |  |  |
Net loss | $ (1,901,000) |  |  |

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