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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2005
Income Taxes [Line Items] |  |  |  |  |
Uncertain tax benefit positions that would reduce the effective income tax rate if recognized | $ 220,000 | $ 220,000 |  |  |
Dividend-received deduction |  | 85.00% |  |  |
Valuation allowance | 3,700,000 | $ 5,668,000 |  |  |
Accrual for interest and penalties | 4,000 | 4,000 |  |  |
Net increase (decrease) in accrued interest and penalties |  | (2,000) |  |  |
Dividends declared not paid | 1,474,892 | 1,474,892 | $ 1,446,498 | $ 1,436,318 |
Domestic Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards | 3,647,000 | 3,647,000 |  |  |
Income tax benefit related to research and development credits |  | 1,554,000 |  |  |
Tax credit carryforward related to research and development | 496,000 | 496,000 |  |  |
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 | 594,000 |  |  |
Austin Taylor Communications, Ltd. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Pretax income (losses) |  | 1,742,000 | 389,000 | 428,000 |
Net operating loss carryforwards | 8,077,000 | 8,077,000 |  |  |
Transition Networks EMEA, Ltd. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Pretax income (losses) |  | (558,000) | (54,000) | 2,754,000 |
Net operating loss carryforwards | 0 | 0 |  |  |
Transition Networks China [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Pretax income (losses) |  | 29,000 | 345,000 | 341,000 |
Net operating loss carryforwards | 374,000 | 374,000 |  |  |
Suttle Costa Rica, S.A. [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Pretax income (losses) |  | 446,000 | $ 321,000 | $ 152,000 |
Net operating loss carryforwards | $ 0 | $ 0 |  |  |
Dividends declared not paid |  |  |  |  | $ 3,500,000

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