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Note 11 - Capital Stock and Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule Of Stock Options And Restricted Stock Units Activity Roll forward [Table Text Block] |
|  | Stock Options |  | Restricted Stock Units |  | Market Condition RSU's
|  |  |  | Weighted |  |  |  |  |  |  |  |
|  | Stock |  | Average |  | Restricted |  |  |  | Market |  |
|  | Options |  | Exercise |  | Stock Units |  | Grant Date |  | Condition RSU's |  | Grant Date
|  | Outstanding |  | Price |  | Outstanding |  | Fair Value |  | Outstanding |  | Fair Value
Balance at December 31, 2019 |  |  | 2,266,122 |  |  | $ | 3.93 |  |  |  | 1,590,450 |  |  | $ | 2.27 |  |  |  | 529,491 |  |  | $ | 1.67 |
Granted |  |  | 42,373 |  |  |  | 2.58 |  |  |  | 142,766 |  |  |  | 3.00 |  |  |  | - |  |  |  | - |
Vested (RSUs) |  |  | - |  |  |  | - |  |  |  | (267,588 | ) |  |  | 2.75 |  |  |  | - |  |  |  | - |
Cancelled / forfeited |  |  | (49,074 | ) |  |  | 3.81 |  |  |  | (31,795 | ) |  |  | 3.02 |  |  |  | - |  |  |  | - |
Balance at March 31, 2020 |  |  | 2,259,421 |  |  | $ | 3.90 |  |  |  | 1,433,833 |  |  | $ | 2.24 |  |  |  | 529,491 |  |  | $ | 1.67 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
|  | (in thousands)
Cost of product revenues |  | $ | 10 |  |  | $ | 13 |
Sales and marketing |  |  | 51 |  |  |  | (7 | )
General and administrative |  |  | 696 |  |  |  | 551 |
Research and development |  |  | 36 |  |  |  | 34 |
Total stock-based compensation |  | $ | 793 |  |  | $ | 591 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Basic |  |  | 38,328,791 |  |  |  | 37,644,684 |
Diluted |  |  | 38,328,791 |  |  |  | 37,644,684 |
Black Scholes Option Pricing Model [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020
Volatility |  |  | 54.83 | %
Risk-free interest rate |  |  | 1.16 | %
Expected holding period (in years) |  |  | 4.6 |

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