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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 (3,000) 184,000
Other comprehensive loss           13,000     13,000
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, 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
Other comprehensive loss                 0
Exercise stock options         54,000       $ 54,000
Exercise stock options (in Shares) 45,000               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 5,035,235 762,612 762,612