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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, 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   762,612            
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Consolidated net income             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   762,612            
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Other comprehensive loss                 (5,000)
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            
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            
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Consolidated net income             119,000   119,000
Other comprehensive 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            
Balance at Dec. 31, 2020 $ 5,000   $ 1,000   11,071,000 (66,000) 2,231,000   13,242,000
Balance (in Shares) at Dec. 31, 2020 5,062,235 5,062,235 762,612 762,612          
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Consolidated net income             337,000   337,000
Other comprehensive loss           (13,000)     (13,000)
Amortization of stock based compensation         8,000       8,000
Cash dividends             (233,000)   (233,000)
Balance at Mar. 31, 2021 $ 5,000   $ 1,000   11,079,000 (79,000) 2,335,000   13,341,000
Balance (in Shares) at Mar. 31, 2021 5,062,235   762,612            
Balance at Dec. 31, 2020 $ 5,000   $ 1,000   11,071,000 (66,000) 2,231,000   13,242,000
Balance (in Shares) at Dec. 31, 2020 5,062,235 5,062,235 762,612 762,612          
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Other comprehensive loss                 $ (16,000)
Exercise stock options (in Shares)                 31,500
Balance at Jun. 30, 2021 $ 5,000   $ 1,000   11,131,000 (82,000) 2,692,000   $ 13,747,000
Balance (in Shares) at Jun. 30, 2021 5,093,568 5,093,568 762,612 762,612          
Balance at Mar. 31, 2021 $ 5,000   $ 1,000   11,079,000 (79,000) 2,335,000   13,341,000
Balance (in Shares) at Mar. 31, 2021 5,062,235   762,612            
Three months ending March 31, 2020 and June 30, 2020 (unaudited):                  
Consolidated net income             590,000   590,000
Other comprehensive loss           (3,000)     (3,000)
Exercise stock options         46,000       46,000
Exercise stock options (in Shares) 31,333                
Amortization of stock based compensation         6,000       6,000
Cash dividends             (233,000)   (233,000)
Balance at Jun. 30, 2021 $ 5,000   $ 1,000   $ 11,131,000 $ (82,000) $ 2,692,000   $ 13,747,000
Balance (in Shares) at Jun. 30, 2021 5,093,568 5,093,568 762,612 762,612