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Note 3 - Recent Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Inventory, net | $ 18,856,000 |  | $ 18,856,000 |  | $ 16,986,000 | $ 17,641,000
Contract assets | 1,826,000 |  | 1,826,000 |  | 825,000 | 0
Accumulated deficit | (114,738,000) |  | (114,738,000) |  | (111,421,000) | $ (111,591,000)
Net revenue | 21,101,000 | $ 21,371,000 | 64,014,000 | $ 60,805,000 |  |
Cost of sales | 19,899,000 | 20,630,000 | 57,847,000 | 58,988,000 |  |
Gross profit | 1,202,000 | 741,000 | 6,167,000 | 1,817,000 |  |
Selling, general and administrative | 2,942,000 | 3,134,000 | 9,261,000 | 10,125,000 |  |
Severance, equipment relocation and other costs | 274,000 | 357,000 | 1,088,000 | 2,235,000 |  |
Operating loss | (2,014,000) | (2,755,000) | (4,182,000) | (10,579,000) |  |
Interest expense, net | 231,000 | 208,000 | 665,000 | 602,000 |  |
Other (income), net | 56,000 | 115,000 | (1,651,000) | (1,663,000) |  |
Income before taxes | (2,301,000) | (3,078,000) | (3,196,000) | (9,518,000) |  |
Income tax expense | 35,000 | 55,000 | 121,000 | 70,000 |  |
Net loss | (2,336,000) | $ (3,133,000) | (3,317,000) | $ (9,588,000) |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Inventory, net |  |  |  |  | (655,000) |
Contract assets |  |  |  |  | 825,000 |
Accumulated deficit |  |  |  |  | $ 170,000 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Inventory, net | 20,397,000 |  | 20,397,000 |  |  |
Contract assets | 0 |  | 0 |  |  |
Accumulated deficit | (115,023,000) |  | (115,023,000) |  |  |
Net revenue | 21,125,000 |  | 63,012,000 |  |  |
Cost of sales | 19,852,000 |  | 56,960,000 |  |  |
Gross profit | 1,273,000 |  | 6,052,000 |  |  |
Selling, general and administrative | 2,942,000 |  | 9,261,000 |  |  |
Severance, equipment relocation and other costs | 274,000 |  | 1,088,000 |  |  |
Operating loss | (1,943,000) |  | (4,297,000) |  |  |
Interest expense, net | 231,000 |  | 665,000 |  |  |
Other (income), net | 56,000 |  | (1,651,000) |  |  |
Income before taxes | (2,230,000) |  | (3,311,000) |  |  |
Income tax expense | 35,000 |  | 121,000 |  |  |
Net loss | (2,265,000) |  | (3,432,000) |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Inventory, net | (1,541,000) |  | (1,541,000) |  |  |
Contract assets | 1,826,000 |  | 1,826,000 |  |  |
Accumulated deficit | 285,000 |  | 285,000 |  |  |
Net revenue | (24,000) |  | 1,002,000 |  |  |
Cost of sales | 47,000 |  | 887,000 |  |  |
Gross profit | (71,000) |  | 115,000 |  |  |
Selling, general and administrative | 0 |  | 0 |  |  |
Severance, equipment relocation and other costs | 0 |  | 0 |  |  |
Operating loss | (71,000) |  | 115,000 |  |  |
Interest expense, net | 0 |  | 0 |  |  |
Other (income), net | 0 |  | 0 |  |  |
Income before taxes | (71,000) |  | 115,000 |  |  |
Income tax expense | 0 |  | 0 |  |  |
Net loss | $ (71,000) |  | $ 115,000 |  |  |

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