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Note 15 - Income Tax - Deferred Income Tax Components (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loss carry-forwards and other credits | $ 37,869 | $ 56,822
Expenses not currently deductible | 22,830 | 22,525
Stock-based compensation | 525 | 474
Investments | 11,956 | 17,303
Provision for doubtful accounts | 4,221 | 4,990
Financing fees | 162 | 376
Net unrealized foreign exchange losses | (634) | (399)
Depreciation and amortization | (32,035) | (21,713)
Less: valuation allowance | (11,079) | (12,707)
Net deferred income tax asset | $ 33,815 | $ 67,671

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