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Note 14 - Stock Option Plans - Stock-based Compensation Allocation to Operating Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allocated share based compensation expense | $ 2,876 | $ 2,574 | $ 1,457
Network Expenses [Member] |  |  |
Allocated share based compensation expense | 307 | 223 | 110
Sales and Marketing Expense [Member] |  |  |
Allocated share based compensation expense | 1,251 | 1,025 | 573
Technical Operations and Development [Member] |  |  |
Allocated share based compensation expense | 596 | 636 | 360
General and Administrative Expense [Member] |  |  |
Allocated share based compensation expense | $ 722 | $ 690 | $ 414

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