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]	Parent [Member]	Total
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
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	4,990,235	762,612	762,612
Consolidated net income (loss)							1,359,000	$ (100,000)	1,259,000	1,359,000
Other comprehensive income (loss)						(104,000)			(104,000)	(104,000)
Exercise stock options					85,000				85,000	$ 85,000
Exercise stock options (in Shares)	72,000									72,000
Amortization of stock based compensation					27,000				27,000	$ 27,000
Cash dividends							(840,000)		(840,000)	(840,000)
Balance at Dec. 31, 2020	$ 5,000		$ 1,000		$ 11,071,000	$ (66,000)	$ 2,231,000		$ 13,242,000	$ 13,242,000
Balance (in Shares) at Dec. 31, 2020	5,062,235	5,062,235	762,612	762,612