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Note 13 - Capital Stock (Tables)
 12 Months Ended
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    
-
 %    
-
 %