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Note 13 - Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
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
|  | Stock |  | Weighted |  | Restricted |  |  |  | Market |  |
|  | Options |  | Average |  | Stock Units |  | Grant Date |  | Condition RSU's |  | Grant Date
|  | Outstanding |  | Exercise Price |  | Outstanding |  | Fair Value |  | Outstanding |  | Fair Value
Balance at December 31, 2017 |  |  | 3,780,244 |  |  | $ | 3.95 |  |  |  | 1,796,927 |  |  | $ | 2.69 |  |  |  | 164,127 |  |  | $ | 4.81 |
Granted |  |  | 104,585 |  |  |  | 4.48 |  |  |  | 639,126 |  |  |  | 4.31 |  |  |  | 156,944 |  |  |  | 4.19 |
Exercised |  |  | (1,696,255 | ) |  |  | 3.50 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested (RSUs) |  |  | - |  |  |  | - |  |  |  | (845,326 | ) |  |  | 2.88 |  |  |  | (69,667 | ) |  |  | 4.81 |
Cancelled / forfeited |  |  | (231,842 | ) |  |  | 4.96 |  |  |  | (356,965 | ) |  |  | 2.84 |  |  |  | (134,460 | ) |  |  | 4.63 |
Balance at December 31, 2018 |  |  | 1,956,732 |  |  |  | 4.25 |  |  |  | 1,233,762 |  |  |  | 3.36 |  |  |  | 116,944 |  |  |  | 4.19 |
Granted |  |  | 943,424 |  |  |  | 3.28 |  |  |  | 1,652,720 |  |  |  | 2.31 |  |  |  | 605,005 |  |  |  | 1.98 |
Exercised |  |  | (3,750 | ) |  |  | 2.98 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested (RSUs) |  |  | - |  |  |  | - |  |  |  | (813,762 | ) |  |  | 3.29 |  |  |  | (3,778 | ) |  |  | 4.19 |
Cancelled / forfeited |  |  | (630,284 | ) |  |  | 3.96 |  |  |  | (482,270 | ) |  |  | 3.42 |  |  |  | (188,680 | ) |  |  | 4.18 |
Balance at December 31, 2019 |  |  | 2,266,122 |  |  | $ | 3.93 |  |  |  | 1,590,450 |  |  | $ | 2.27 |  |  |  | 529,491 |  |  | $ | 1.67 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Year Ended December 31,
|  | 2019 |  | 2018
Basic |  |  | 37,813,580 |  |  |  | 36,453,126 |
Dillutive effect of equity awards |  |  | - |  |  |  | - |
Diluted |  |  | 37,813,580 |  |  |  | 36,453,126 |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  | Options Outstanding |  | Options Exercisable
|  |  |  | Weighted |  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | Average |  | Weighted |  |  |  |  |  | Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  | Aggregate |  | Shares |  | Remaining |  | Average |  | Aggregate
Exercise |  | Outstanding at |  | Contractual Life |  | Exercise |  | Intrinsic |  | Exercisable at |  | Contractual Life |  | Exercise |  | Intrinsic
Price |  | Dec. 31, 2019 |  | in Years |  | Price |  | Value |  | Dec. 31, 2019 |  | in Years |  | Price |  | Value
$1.78 | - | 2.59 |  |  | 234,399 |  |  |  | 6.48 |  |  | $ | 2.14 |  |  | $ | 213 |  |  |  | 94,069 |  |  |  | 1.94 |  |  | $ | 2.57 |  |  | $ | 45 |
2.60 | - | 2.94 |  |  | 208,414 |  |  |  | 9.52 |  |  |  | 2.84 |  |  |  | 44 |  |  |  | 10,000 |  |  |  | 7.25 |  |  |  | 2.60 |  |  |  | 5 |
2.95 | - | 3.49 |  |  | 264,571 |  |  |  | 8.00 |  |  |  | 3.23 |  |  |  | - |  |  |  | 148,400 |  |  |  | 7.45 |  |  |  | 3.27 |  |  |  | - |
3.50 | - | 3.92 |  |  | 305,839 |  |  |  | 7.32 |  |  |  | 3.74 |  |  |  | - |  |  |  | 166,431 |  |  |  | 5.76 |  |  |  | 3.70 |  |  |  | - |
3.93 | - | 4.08 |  |  | 65,849 |  |  |  | 1.42 |  |  |  | 4.04 |  |  |  | - |  |  |  | 65,849 |  |  |  | 1.42 |  |  |  | 4.04 |  |  |  | - |
4.09 | - | 4.17 |  |  | 355,625 |  |  |  | 4.41 |  |  |  | 4.12 |  |  |  | - |  |  |  | 355,625 |  |  |  | 4.41 |  |  |  | 4.12 |  |  |  | - |
4.18 | - | 4.38 |  |  | 370,000 |  |  |  | 3.93 |  |  |  | 4.30 |  |  |  | - |  |  |  | 370,000 |  |  |  | 3.93 |  |  |  | 4.30 |  |  |  | - |
4.39 | - | 5.39 |  |  | 141,550 |  |  |  | 5.56 |  |  |  | 4.99 |  |  |  | - |  |  |  | 126,550 |  |  |  | 5.22 |  |  |  | 5.04 |  |  |  | - |
5.40 | - | 5.54 |  |  | 174,875 |  |  |  | 5.18 |  |  |  | 5.51 |  |  |  | - |  |  |  | 174,875 |  |  |  | 5.18 |  |  |  | 5.51 |  |  |  | - |
5.55 | - | 5.75 |  |  | 145,000 |  |  |  | 5.65 |  |  |  | 5.58 |  |  |  | - |  |  |  | 137,500 |  |  |  | 5.49 |  |  |  | 5.57 |  |  |  | - |
$1.78 | - | 5.78 |  |  | 2,266,122 |  |  |  | 5.95 |  |  | $ | 3.93 |  |  | $ | 257 |  |  |  | 1,649,299 |  |  |  | 4.70 |  |  | $ | 4.28 |  |  | $ | 50 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31,
|  | 2019 |  | 2018
|  | (in thousands)
Cost of product revenues |  | $ | 43 |  |  | $ | 64 |
Sales and marketing |  |  | 119 |  |  |  | 431 |
General and administrative |  |  | 2,710 |  |  |  | 2,232 |
Research and development |  |  | 162 |  |  |  | 167 |
Discontinued operations |  |  | - |  |  |  | 150 |
Total stock-based compensation |  | $ | 3,034 |  |  | $ | 3,044 |
Monte-Carlo Valuation Simulation [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  | 2018
Volatility |  |  | 58.96 | % |  |  | 44.02 | %
Risk-free interest rate |  |  | 1.99 | % |  |  | 2.27 | %
Correlation coefficient |  |  | 23.59 | % |  |  | 0.07 | %
Dividend yield |  |  | - | % |  |  | - | %
Black Scholes Option Pricing Model [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2019 |  | 2018
Volatility |  |  | 48.11 | % |  |  | 43.28 | %
Risk-free interest rate |  |  | 2.12 | % |  |  | 2.84 | %
Expected holding period (in years) |  |  | 4.7 |  |  |  | 4.8 |
Dividend Yield |  |  | - | % |  |  | - | %

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