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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]
Parent [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     $ 11,761,000
Balance (in Shares) at Dec. 31, 2017 4,808,235 762,612                
Consolidated net income (loss)         1,378,000 (4,000) 1,374,000     1,378,000
Other comprehensive income (loss)       (16,000)     (16,000)     (16,000)
Exercise stock options     60,000       60,000     $ 60,000
Exercise stock options (in Shares) 59,000                 59,000
Amortization of stock based compensation     8,000       8,000     $ 8,000
Cash dividends         (589,000)   (589,000)     (589,000)
Balance at Dec. 31, 2018 $ 5,000 $ 1,000 10,812,000 128,000 1,656,000 96,000 12,698,000     12,602,000
Balance (in Shares) at Dec. 31, 2018 4,867,235 762,612           4,867,235 762,612  
Consolidated net income (loss)         773,000 4,000 777,000     773,000
Other comprehensive income (loss)       (90,000)     (90,000)     (90,000)
Exercise stock options     126,000       126,000     $ 126,000
Exercise stock options (in Shares) 123,000                 123,000
Amortization of stock based compensation     21,000       21,000     $ 21,000
Cash dividends         (717,000)   (717,000)     (717,000)
Balance at Dec. 31, 2019 $ 5,000 $ 1,000 $ 10,959,000 $ 38,000 $ 1,712,000 $ 100,000 $ 12,815,000     $ 12,715,000
Balance (in Shares) at Dec. 31, 2019 4,990,235 762,612           4,990,235 762,612