Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.10.0.1
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2005
Income Taxes [Line Items]        
Uncertain tax benefit positions that would reduce the effective income tax rate if recognized   $ 61,000    
Dividend payable   $ 184,541 $ 397,151  
Dividend-received deduction   85.00%    
Cumulative loss, period used to evaluate negative objective evidence   3 years    
Valuation allowance   $ 9,834,000    
Expiration of statute of limitations   9,000 65,000  
Accrual for interest and penalties   0    
Net increase (decrease) in accrued interest and penalties   (4,000)    
Scenario, Forecast [Member]        
Income Taxes [Line Items]        
Expiration of statute of limitations $ 0      
Domestic Tax Authority [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards   15,264,000    
Income tax benefit related to research and development credits   1,554,000    
Tax credit carryforward related to research and development   $ 467,000    
Operating loss carryforward expiration date   Dec. 31, 2035    
State and Local Jurisdiction [Member]        
Income Taxes [Line Items]        
Income tax benefit related to research and development credits   $ 1,024,000    
Tax credit carryforward related to research and development   594,000    
Austin Taylor Communications, Ltd. [Member]        
Income Taxes [Line Items]        
Pretax income (losses)   0 0  
Net operating loss carryforwards   7,462,000    
Net2Edge [Member]        
Income Taxes [Line Items]        
Pretax income (losses)   (2,772,000) (2,616,000)  
Net operating loss carryforwards   7,231,000    
Transition Networks China [Member]        
Income Taxes [Line Items]        
Pretax income (losses)   0 0  
Net operating loss carryforwards   374,000    
Suttle Costa Rica, S.A. [Member]        
Income Taxes [Line Items]        
Pretax income (losses)   (45,000) $ 1,582,000  
Net operating loss carryforwards   0    
Dividend payable       $ 3,500,000
Deferred tax, undistributed earnings   $ 0