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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
Common Class A [Member]
Common Stock [Member]
Common Class A [Member]
Common Class B [Member]
Common Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Total
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            
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            
Consolidated net income (loss)                 955,000
Balance at Sep. 30, 2019 $ 5,000   $ 1,000   10,952,000 43,000 2,062,000 100,000 13,163,000
Balance (in Shares) at Sep. 30, 2019 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            
Consolidated net income (loss)             478,000 37,000 515,000
Other comprehensive income (loss)           (100,000)   (28,000) (128,000)
Amortization of stock based compensation         5,000       5,000
Cash dividends             (173,000)   (173,000)
Balance at Sep. 30, 2019 $ 5,000   $ 1,000   10,952,000 43,000 2,062,000 100,000 13,163,000
Balance (in Shares) at Sep. 30, 2019 4,990,235   762,612            
Balance at Dec. 31, 2019 $ 5,000   $ 1,000   10,959,000 38,000 1,712,000 100,000 12,815,000
Balance (in Shares) at Dec. 31, 2019 4,990,235 4,990,235 762,612 762,612          
Consolidated net income (loss)             90,000   90,000
Exercise stock options         54,000       54,000
Exercise stock options (in Shares) 45,000                
Amortization of stock based compensation         6,000       6,000
Cash dividends             (201,000)   (201,000)
Balance at Mar. 31, 2020 $ 5,000   $ 1,000   11,019,000 38,000 1,601,000 100,000 12,764,000
Balance (in Shares) at Mar. 31, 2020 5,035,235   762,612            
Balance at Dec. 31, 2019 $ 5,000   $ 1,000   10,959,000 38,000 1,712,000 100,000 12,815,000
Balance (in Shares) at Dec. 31, 2019 4,990,235 4,990,235 762,612 762,612          
Consolidated net income (loss)                 $ 652,000
Exercise stock options (in Shares)                 50,000
Balance at Sep. 30, 2020 $ 5,000   $ 1,000   11,037,000 33,000 1,757,000 100,000 $ 12,933,000
Balance (in Shares) at Sep. 30, 2020 5,040,235 5,040,235 762,612 762,612          
Balance at Mar. 31, 2020 $ 5,000   $ 1,000   11,019,000 38,000 1,601,000 100,000 12,764,000
Balance (in Shares) at Mar. 31, 2020 5,035,235   762,612            
Consolidated net income (loss)             119,000   119,000
Other comprehensive income (loss)           (5,000)     (5,000)
Exercise stock options         5,000       5,000
Exercise stock options (in Shares) 5,000                
Amortization of stock based compensation         7,000       7,000
Cash dividends             (203,000)   (203,000)
Balance at Jun. 30, 2020 $ 5,000   $ 1,000   11,031,000 33,000 1,517,000 100,000 12,687,000
Balance (in Shares) at Jun. 30, 2020 5,040,235   762,612            
Consolidated net income (loss)             443,000   443,000
Amortization of stock based compensation         6,000       6,000
Cash dividends             (203,000)   (203,000)
Balance at Sep. 30, 2020 $ 5,000   $ 1,000   $ 11,037,000 $ 33,000 $ 1,757,000 $ 100,000 $ 12,933,000
Balance (in Shares) at Sep. 30, 2020 5,040,235 5,040,235 762,612 762,612