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Note 23 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
    First   Second   Third   Fourth   Fiscal
2019
   Quarter   Quarter   Quarter   Quarter   Year
    (in thousands, except per share data)
Revenues   $
28,202
     $
29,584
     $
27,418
     $
30,972
     $
116,176
  
Cost of revenues    
12,048
      
13,629
      
12,439
      
13,738
      
51,854
  
Gross profit    
16,154
      
15,955
      
14,979
      
17,234
      
64,322
  
Total operating expenses    
16,273
      
15,727
      
16,344
      
15,601
      
63,945
  
Operating (loss) income    
(119
 )    
228
      
(1,365
 )    
1,633
      
377
  
Other expense, net    
(1,675
 )    
(1,360
 )    
(1,309
 )    
(1,535
 )    
(5,879
 )
(Loss) income before income taxes    
(1,794
 )    
(1,132
 )    
(2,674
 )    
98
      
(5,502
 )
Income tax expense (benefit)    
576
      
(885
 )    
(54
 )    
(452
 )    
(815
 )
Net (loss) income   $
(2,370
 )   $
(247
 )   $
(2,620
 )   $
550
     $
(4,687
 )
                                         
(Loss) earnings per share:                                        
Basic (loss) earnings per common share   $
(0.06
 )   $
(0.01
 )   $
(0.07
 )   $
0.02
     $
(0.12
 )
                                         
Diluted (loss) earnings per common share   $
(0.06
 )   $
(0.01
 )   $
(0.07
 )   $
0.02
     $
(0.12
 )
    First   Second   Third   Fourth   Fiscal
2018
   Quarter   Quarter   Quarter   Quarter   Year
    (in thousands, except per share data)
Revenues   $
26,759
     $
31,522
     $
28,635
     $
33,858
     $
120,774
  
Cost of revenues    
13,490
      
16,167
      
12,818
      
15,118
      
57,593
  
Gross profit    
13,269
      
15,355
      
15,817
      
18,740
      
63,181
  
Total operating expenses    
14,535
      
15,737
      
14,927
      
16,998
      
62,197
  
Operating (loss) income    
(1,266
 )    
(382
 )    
890
      
1,742
      
984
  
Other expense, net    
(3,979
 )    
(1,485
 )    
(1,798
 )    
(1,697
 )    
(8,959
 )
(Loss) income from continuing operations before income taxes    
(5,245
 )    
(1,867
 )    
(908
 )    
45
      
(7,975
 )
Income tax expense (benefit)    
605
      
(369
 )    
(652
 )    
(3,260
 )    
(3,676
 )
Net (loss) income from continuing operations    
(5,850
 )    
(1,498
 )    
(256
 )    
3,305
      
(4,299
 )
Income (loss) from discontinued operations, net of tax    
1,786
      
34
      
-
      
(443
 )    
1,377
  
Net (loss) income   $
(4,064
 )   $
(1,464
 )   $
(256
 )   $
2,862
     $
(2,922
 )
                                         
(Loss) earnings per share:                                        
Basic (loss) earnings per common share from continuing operations   $
(0.16
 )   $
(0.04
 )   $
(0.01
 )   $
0.09
     $
(0.12
 )
Basic earnings (loss) per common share from discontinued operations    
0.05
      
-
      
-
      
(0.01
 )    
0.04
  
Basic (loss) earnings per common share   $
(0.11
 )   $
(0.04
 )   $
(0.01
 )   $
0.08
     $
(0.08
 )
                                         
Diluted (loss) earnings per common share from continuing operations   $
(0.16
 )   $
(0.04
 )   $
(0.01
 )   $
0.09
     $
(0.12
 )
Diluted earnings (loss) per common share from discontinued operations    
0.05
      
-
      
-
      
(0.01
 )    
0.04
  
Diluted (loss) earnings per common share   $
(0.11
 )   $
(0.04
 )   $
(0.01
 )   $
0.08
     $
(0.08
 )