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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Segment | Dec. 31, 2012 Segment | Dec. 31, 2011 Segment | Dec. 31, 2013 Class A [Member] | Sep. 30, 2013 Class A [Member] | Jun. 30, 2013 Class A [Member] | Mar. 31, 2013 Class A [Member] | Dec. 31, 2012 Class A [Member] | Sep. 30, 2012 Class A [Member] | Jun. 30, 2012 Class A [Member] | Mar. 31, 2012 Class A [Member] | Dec. 31, 2013 Class A [Member] | Dec. 31, 2012 Class A [Member] | Dec. 31, 2011 Class A [Member] | Dec. 31, 2013 Class B [Member] | Sep. 30, 2013 Class B [Member] | Jun. 30, 2013 Class B [Member] | Mar. 31, 2013 Class B [Member] | Dec. 31, 2012 Class B [Member] | Sep. 30, 2012 Class B [Member] | Jun. 30, 2012 Class B [Member] | Mar. 31, 2012 Class B [Member] | Dec. 31, 2013 Class B [Member] | Dec. 31, 2012 Class B [Member] | Dec. 31, 2011 Class B [Member] | Dec. 31, 2013 Machinery and Equipment [Member] Minimum [Member] | Dec. 31, 2013 Machinery and Equipment [Member] Maximum [Member] | Dec. 31, 2013 Buildings and Leasehold Improvements [Member] Minimum [Member] | Dec. 31, 2013 Buildings and Leasehold Improvements [Member] Maximum [Member] | Mar. 09, 2012 GigaCom Interconnect [Member] | Dec. 31, 2013 GigaCom Interconnect [Member] | Dec. 31, 2012 GigaCom Interconnect [Member] | Sep. 12, 2012 Powerbox [Member] | Jul. 31, 2012 Fibreco [Member] | Aug. 20, 2013 Array [Member] | Mar. 29, 2013 TRP [Member]
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired tax assets and liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 09, 2012 |  |  | Sep. 12, 2012 | Jul. 31, 2012 | Aug. 20, 2013 | Mar. 29, 2013
Acquisition of issued and outstanding capital stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% | 100.00% | 100.00% | 100.00%
Allowance for doubtful accounts | $ 941,000 |  |  |  |  |  | $ 743,000 |  |  |  |  |  | $ 941,000 |  | $ 743,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other-than-temporary impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on sales of investments |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | (100,000) |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Chinese Renminbi foreign currency exchange rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net currency exchange (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | (600,000) |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | 977,000 |  | 281,000 |  | (236,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty period for workmanship defects |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 13 years | 2 years | 39 years |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate Class B common stock in excess of dividend rate of Class A common stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Undistributed earning allocation rate of Class B common stock in excess of Class A common stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 7,397,000 | 7,380,000 | [1] | 1,689,000 | [1] | (558,000) | (2,432,000) | [2] | 2,492,000 | 1,441,000 | [2] | 872,000 | 15,908,000 | [3] | 2,373,000 | [3] | 3,764,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,868,000 |  | 372,000 |  | 620,000 |  |  |  |  |  |  |  |  |  |  |  |  | 13,040,000 |  | 2,001,000 |  | 3,144,000 |  |  |  |  |  |  |  |  |  |  |
Less Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 522,000 |  | 522,000 |  | 522,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,576,000 |  | 2,697,000 |  | 2,690,000 |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 12,810,000 |  | (846,000) |  | 552,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,346,000 |  | (150,000) |  | 98,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,464,000 |  | (696,000) |  | 454,000 |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 12,810,000 |  | (846,000) |  | 552,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,346,000 |  | (150,000) |  | 98,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,464,000 |  | (696,000) |  | 454,000 |  |  |  |  |  |  |  |  |  |  |
Net earnings allocation basic and diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 7,397,000 | 7,380,000 | [1] | 1,689,000 | [1] | (558,000) | (2,432,000) | [2] | 2,492,000 | 1,441,000 | [2] | 872,000 | 15,908,000 | [3] | 2,373,000 | [3] | 3,764,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,868,000 |  | 372,000 |  | 620,000 |  |  |  |  |  |  |  |  |  |  |  |  | 13,040,000 |  | 2,001,000 |  | 3,144,000 |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,174,912 |  | 2,174,912 |  | 2,174,912 |  |  |  |  |  |  |  |  |  |  |  |  | 9,239,646 |  | 9,624,578 |  | 9,597,661 |  |  |  |  |  |  |  |  |  |  |
Earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.61 | $ 0.62 | [1] | $ 0.14 | [1] | $ (0.05) | $ (0.21) | [2] | $ 0.20 | $ 0.11 | [2] | $ 0.07 | $ 1.32 | [3] | $ 0.17 | [3] | $ 0.28 | $ 0.65 | $ 0.65 | [1] | $ 0.15 | [1] | $ (0.05) | $ (0.21) | [2] | $ 0.21 | $ 0.12 | [2] | $ 0.08 | $ 1.41 | [3] | $ 0.21 | [3] | $ 0.33 |  |  |  |  |  |  |  |  |  |  |
Research and Development Costs |  |  |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  | 12,400,000 |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 600,000 |  |  |  |
Impairment charges related to property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of the building and land |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset write-downs related to property, plant and equipment |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The net earnings for the quarters ended June 30, 2013 and September 30, 2013 have been restated to include the effects of measurement period adjustments related to the acquisitions of TRP and Array. These measurement period adjustments reduced the previously-reported net earnings by $0.7 million and $0.5 million for the quarters ended June 30, 2013 and September 30, 2013, respectively, and primarily related to the step-up of inventory to fair value, and higher depreciation and amortization expense related to the appraised fair values of property, plant and equipment, and the various intangible assets as further described in Note 2.
[2] | The net loss for the quarter ended December 31, 2012 includes $3.1 million of restructuring charges primarily related to severance charges and the write-down of assets associated with the closure of the Company’s Vinita, Oklahoma manufacturing facility.
[3] | Quarterly amounts of earnings per share may not agree to the total for the year due to rounding.

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