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Segment reporting and concentrations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues $ 60,929 $ 63,074  
Income (loss) before provision for income taxes (5,074) (4,785)  
Total assets 47,871 47,588  
Goodwill 2,832 2,734 $ 1,476
Before Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [1] (5,074) (4,785)  
After Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [2] (5,074) (4,785)  
IADS [Member]      
Segment Reporting Information [Line Items]      
Revenues 4,751 4,347  
Total assets 1,331 1,282  
IADS [Member] | Before Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [1] (3,588) (4,664)  
IADS [Member] | After Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [2] (596) (1,778)  
MIS [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes 9,425 8,088  
Total assets 21,020 21,874  
Goodwill 2,157 2,059  
MIS [Member] | Before Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [1] (2,813) (1,258)  
MIS [Member] | After Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [2] (2,749) (1,231)  
DDS [Member]      
Segment Reporting Information [Line Items]      
Revenues 46,753 50,639  
Total assets 25,520 24,432  
Goodwill 675 675  
DDS [Member] | Before Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [1] 1,327 1,137  
DDS [Member] | After Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Income (loss) before provision for income taxes [2] $ (1,729) $ (1,776)  
[1] Before elimination of any inter-segment profits
[2] After elimination of any inter-segment profits