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Note 14 - Income Tax - Deferred Income Tax Components (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loss carry-forwards and other credits | $ 19,056 | $ 37,869
Expenses not currently deductible | 31,508 | 34,265
Revenue not currently taxable | (8,416) | (15,227)
Stock-based compensation | 157 | 525
Investments | 10,628 | 11,290
Provision for doubtful accounts | 4,871 | 4,221
Financing fees | (83) | 162
Net unrealized foreign exchange losses | 126 | (634)
Depreciation and amortization | (42,257) | (32,035)
Less: valuation allowance | (8,945) | (11,079)
Net deferred income tax asset | $ 6,645 | $ 29,357

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