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Condensed 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, 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              
Consolidated net income (loss)         61,000 (2,000)     59,000
Other comprehensive income (loss)       (7,000)   1,000     (6,000)
Amortization of stock based compensation     1,000           1,000
Cash dividends         (139,000)       (139,000)
Balance at Mar. 31, 2018 $ 5,000 $ 1,000 10,745,000 137,000 789,000 99,000     11,776,000
Balance (in Shares) at Mar. 31, 2018 4,808,235 762,612              
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              
Consolidated net income (loss)                 458,000
Other comprehensive income (loss)                 2,000
Balance at Jun. 30, 2018 $ 5,000 $ 1,000 10,764,000 146,000 1,051,000 97,000     12,064,000
Balance (in Shares) at Jun. 30, 2018 4,828,235 762,612              
Balance at Mar. 31, 2018 $ 5,000 $ 1,000 10,745,000 137,000 789,000 99,000     11,776,000
Balance (in Shares) at Mar. 31, 2018 4,808,235 762,612              
Consolidated net income (loss)         401,000 (2,000)     399,000
Other comprehensive income (loss)       9,000         9,000
Exercise stock options     18,000           18,000
Exercise stock options (in Shares) 20,000                
Amortization of stock based compensation     1,000           1,000
Cash dividends         (139,000)       (139,000)
Balance at Jun. 30, 2018 $ 5,000 $ 1,000 10,764,000 146,000 1,051,000 97,000     12,064,000
Balance (in Shares) at Jun. 30, 2018 4,828,235 762,612              
Balance at Dec. 31, 2018 $ 5,000 $ 1,000 10,812,000 128,000 1,656,000 96,000     12,698,000
Balance (in Shares) at Dec. 31, 2018 4,867,235 762,612         4,867,235 762,612  
Consolidated net income (loss)         186,000 (2,000)     184,000
Other comprehensive income (loss)       13,000   (1,000)     12,000
Exercise stock options     76,000           76,000
Exercise stock options (in Shares) 70,000                
Amortization of stock based compensation     4,000           4,000
Cash dividends         (171,000)       (171,000)
Balance at Mar. 31, 2019 $ 5,000 $ 1,000 10,892,000 141,000 1,671,000 93,000     12,803,000
Balance (in Shares) at Mar. 31, 2019 4,937,235 762,612              
Balance at Dec. 31, 2018 $ 5,000 $ 1,000 10,812,000 128,000 1,656,000 96,000     12,698,000
Balance (in Shares) at Dec. 31, 2018 4,867,235 762,612         4,867,235 762,612  
Consolidated net income (loss)                 440,000
Other comprehensive income (loss)                 $ 15,000
Exercise stock options (in Shares)                 123,000
Balance at Jun. 30, 2019 $ 5,000 $ 1,000 10,947,000 143,000 1,757,000 91,000     $ 12,944,000
Balance (in Shares) at Jun. 30, 2019 4,990,235 762,612         4,990,235 762,612  
Balance at Mar. 31, 2019 $ 5,000 $ 1,000 10,892,000 141,000 1,671,000 93,000     12,803,000
Balance (in Shares) at Mar. 31, 2019 4,937,235 762,612              
Consolidated net income (loss)         258,000 (2,000)     256,000
Other comprehensive income (loss)       2,000         2,000
Exercise stock options     50,000           50,000
Exercise stock options (in Shares) 53,000                
Amortization of stock based compensation     5,000           5,000
Cash dividends         (172,000)       (172,000)
Balance at Jun. 30, 2019 $ 5,000 $ 1,000 $ 10,947,000 $ 143,000 $ 1,757,000 $ 91,000     $ 12,944,000
Balance (in Shares) at Jun. 30, 2019 4,990,235 762,612         4,990,235 762,612