Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Schedule of Disaggregation of Revenues) (Details)

v3.19.3
Revenue Recognition (Schedule of Disaggregation of Revenues) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues $ 18,222,980 $ 15,291,993 $ 50,346,350 $ 47,103,837
Transition Networks [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 12,483,000 9,231,000 30,548,000 26,219,000
Transition Networks [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 11,479,000 8,015,000 26,442,000 22,107,000
Transition Networks [Member] | Rest of World [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 426,000 690,000 1,822,000 2,530,000
Transition Networks [Member] | Europe, Middle East, Africa ("EMEA") [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 578,000 526,000 2,284,000 1,582,000
Transition Networks [Member] | Media Converters [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 5,031,000 5,059,000 15,092,000 14,735,000
Transition Networks [Member] | Ethernet Switches and Adapters [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 5,957,000 2,563,000 10,788,000 6,650,000
Transition Networks [Member] | Other Products [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 1,495,000 1,609,000 4,668,000 4,834,000
Suttle [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,651,000 5,009,000 14,918,000 17,855,000
Suttle [Member] | Communication Service Providers [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 3,506,000 4,258,000 11,463,000 14,705,000
Suttle [Member] | International [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 137,000 350,000 645,000 1,696,000
Suttle [Member] | Distributors [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 414,000 401,000 1,513,000 1,454,000
Suttle [Member] | Other Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 594,000   1,297,000  
Suttle [Member] | Structured Cabling and Connecting System Products [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 3,706,000 4,748,000 12,549,000 16,490,000
Suttle [Member] | DSL and Other Products [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 945,000 261,000 2,369,000 1,365,000
JDL Technologies [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 783,000 859,000 3,942,000 2,482,000
JDL Technologies [Member] | Education [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 63,000 185,000 1,831,000 574,000
JDL Technologies [Member] | Healthcare and Commercial Clients [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 720,000 $ 674,000 $ 2,111,000 $ 1,908,000