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Note 4 - Permit and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Intangible Assets [Table Text Block] |
Permit (amount in thousands) |  | Treatment |
Balance as of December 31, 2013 |  | $ | 16,744 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 20 |
Balance as of December 31, 2014 |  |  | 16,709 |
PCB permit amortized (1) |  |  | (55 | )
Permit in progress |  |  | 107 |
Balance as of December 31, 2015 |  | $ | 16,761 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  |  |  | December 31, 2015 |  |  | December 31, 2014 |
|  | Useful |  |  | Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
|  | Lives |  |  | Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
|  | (Years) |  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Intangibles (amount in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent |  | 8 | - | 18 |  |  | $ | 539 |  |  | $ | (203 | ) |  | $ | 336 |  |  | $ | 512 |  |  | $ | (168 | ) |  | $ | 344 |
Software |  |  | 3 |  |  |  |  | 395 |  |  |  | (364 | ) |  |  | 31 |  |  |  | 375 |  |  |  | (319 | ) |  |  | 56 |
Customer relationships |  |  | 12 |  |  |  |  | 3,370 |  |  |  | (1,671 | ) |  |  | 1,699 |  |  |  | 3,370 |  |  |  | (1,335 | ) |  |  | 2,035 |
Permit |  |  | 10 |  |  |  |  | 545 |  |  |  | (373 | ) |  |  | 172 |  |  |  | 545 |  |  |  | (318 | ) |  |  | 227 |
Total |  |  |  |  |  |  | $ | 4,849 |  |  | $ | (2,611 | ) |  | $ | 2,238 |  |  | $ | 4,802 |  |  | $ | (2,140 | ) |  | $ | 2,662 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | Amount |
Year |  | (In thousands) |
2016 |  | $ | 412 |
2017 |  |  | 366 |
2018 |  |  | 335 |
2019 |  |  | 256 |
2020 |  |  | 221 |
|  | $ | 1,590 |

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