Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.7.0.1
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2005
Income Taxes [Line Items]        
Uncertain tax benefit positions that would reduce the effective income tax rate if recognized $ 219,000      
Effective tax rate (3.30%) 7.20% 38.30%  
Federal tax rate 35.00% 35.00% 35.00%  
Decrease in income tax rate due to the effect of foreign operations 7.20% 3.60% (7.80%)  
Dividends declared not paid $ 412,542 $ 1,474,892 $ 1,446,498  
Dividend-received deduction 85.00%      
Cumulative loss, period used to evaluate negative objective evidence 3 years      
Valuation allowance $ 8,117,000      
Accrual for interest and penalties 19,000      
Net increase (decrease) in accrued interest and penalties (15,000)      
Domestic Tax Authority [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 8,432,000      
Income tax benefit related to research and development credits 1,554,000      
Tax credit carryforward related to research and development $ 496,000      
Operating loss carryforward expiration date Dec. 31, 2035      
Stock options exercised, deduction to federal net operating loss $ 203,000      
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) 615,000 (1,742,000) (389,000)  
Net operating loss carryforwards 7,462,000      
Transition Networks EMEA, Ltd. [Member]        
Income Taxes [Line Items]        
Pretax income (losses) (2,114,000) (558,000) (54,000)  
Net operating loss carryforwards 2,040,000      
Transition Networks China [Member]        
Income Taxes [Line Items]        
Pretax income (losses) 0 (29,000) 345,000  
Net operating loss carryforwards 374,000      
Suttle Costa Rica, S.A. [Member]        
Income Taxes [Line Items]        
Pretax income (losses) $ 463,000 $ 446,000 $ 321,000  
Dividends declared not paid       $ 3,500,000