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Consolidated Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Common Class A [Member]
Common Class B [Member]
Total
Balance at Dec. 31, 2015 $ 5,000 $ 1,000 $ 10,692,000 $ 159,000 $ 4,245,000 $ 104,000     $ 15,206,000
Balance (in Shares) at Dec. 31, 2015 4,768,235 762,612              
Net income (loss)         (3,111,000)       (3,111,000)
Comprehensive loss:                  
Foreign currency translation adjustment       (3,000)         (3,000)
Amortization of stock based compensation     9,000           9,000
Cash dividends         (414,000)       (414,000)
Noncontrolling interest in subsidary                 0
Balance at Dec. 31, 2016 $ 5,000 $ 1,000 10,701,000 156,000 720,000 104,000     11,687,000
Balance (in Shares) at Dec. 31, 2016 4,768,235 762,612         4,768,235 762,612  
Net income (loss)         701,000       701,000
Comprehensive loss:                  
Foreign currency translation adjustment       (12,000)         (12,000)
Exercise stock options     40,000           $ 40,000
Exercise stock options (in Shares) 40,000               40,000
Amortization of stock based compensation     3,000           $ 3,000
Cash dividends         (554,000)       (554,000)
Noncontrolling interest in subsidary           (4,000)     (4,000)
Balance at Dec. 31, 2017 $ 5,000 $ 1,000 $ 10,744,000 $ 144,000 $ 867,000 $ 100,000     $ 11,861,000
Balance (in Shares) at Dec. 31, 2017 4,808,235 762,612         4,808,235 762,612