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Note 16 - Income Tax - Deferred Income Tax Components (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Loss carry-forwards and other credits | $ 56,822 | $ 70,952
Expenses not currently deductible | 22,525 | 22,018
Stock-based compensation | 474 | 210
Investments | 17,303 | 15,470
Provision for doubtful accounts | 4,990 | 3,601
Financing fees | 376 | 267
Net unrealized foreign exchange | (399) |
Net unrealized foreign exchange |  | 3,097
Depreciation and amortization | (21,713) | (18,932)
Less: valuation allowance | (12,707) | (15,603)
Net deferred income tax asset | $ 67,671 | $ 81,080

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