Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.8.0.1
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2005
Income Taxes [Line Items]          
Dividends declared not paid   $ 397,151 $ 412,542    
Uncertain tax benefit positions that would reduce the effective income tax rate if recognized   $ 44,000      
Effective tax rate   0.30% (3.30%)    
Federal tax rate   35.00% 35.00%    
Increase (decrease) in deferred tax assets   $ (3,047,000)      
Increase (decrease) in the valuation allowance for deferred tax assets   $ (3,047,000)      
Foreign income taxes, net of foreign tax credits   (12.80%) (7.20%)    
Uncertain tax positions   $ 41,000 $ 207,000 $ 217,000  
Dividend-received deduction   85.00%      
Cumulative loss, period used to evaluate negative objective evidence   3 years      
Valuation allowance   $ 8,713,000      
Expiration of statute of limitations   65,000 10,000    
Accrual for interest and penalties   4,000      
Net increase (decrease) in accrued interest and penalties   (2,000)      
Scenario, Forecast [Member]          
Income Taxes [Line Items]          
Expiration of statute of limitations $ 13,000        
Scenario, Plan [Member]          
Income Taxes [Line Items]          
Federal tax rate 21.00%        
Domestic Tax Authority [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards   10,663,000      
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)   0 615,000    
Net operating loss carryforwards   7,462,000      
Net2Edge [Member]          
Income Taxes [Line Items]          
Pretax income (losses)   (2,616,000) (2,114,000)    
Net operating loss carryforwards   4,471,000      
Transition Networks China [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards   374,000      
Suttle Costa Rica, S.A. [Member]          
Income Taxes [Line Items]          
Dividends declared not paid         $ 3,500,000
Pretax income (losses)   (1,582,000) $ 463,000    
Net operating loss carryforwards   1,582,000      
Deferred tax, undistributed earnings   $ 0