Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018	13,502,684
Balance at Dec. 31, 2018	$ 135,000	$ 2,669,000	$ 29,390,000	$ 32,194,000
Net income			1,218,000	1,218,000
Common stock repurchased and retired (in shares)	(255,000)
Common stock repurchased and retired	$ (2,000)	(1,006,000)		(1,008,000)
Stock-based compensation expense		122,000		122,000
Options exercised (in shares)	33,334
Options exercised		60,000		60,000
Balance (in shares) at Mar. 31, 2019	13,281,018
Balance at Mar. 31, 2019	$ 133,000	1,845,000	30,608,000	32,586,000
Balance (in shares) at Dec. 31, 2018	13,502,684
Balance at Dec. 31, 2018	$ 135,000	2,669,000	29,390,000	32,194,000
Net income					$ 2,665,000
Balance (in shares) at Sep. 30, 2019	13,004,507
Balance at Sep. 30, 2019	$ 130,000	1,058,000	32,055,000	33,243,000
Balance (in shares) at Mar. 31, 2019	13,281,018
Balance at Mar. 31, 2019	$ 133,000	1,845,000	30,608,000	32,586,000
Net income			1,010,000	1,010,000
Common stock repurchased and retired (in shares)	(172,000)
Common stock repurchased and retired	$ (2,000)	(626,000)		(628,000)
Stock-based compensation expense		138,000		138,000
Options exercised (in shares)
Options exercised
Balance (in shares) at Jun. 30, 2019	13,109,018
Balance at Jun. 30, 2019	$ 131,000	1,357,000	31,618,000	33,106,000
Net income			437,000	437,000	$ 437,000
Common stock repurchased and retired (in shares)	(121,010)
Common stock repurchased and retired	$ (1,000)	(427,000)		(428,000)
Stock-based compensation expense		93,000		93,000
Options exercised (in shares)	16,499
Options exercised		35,000		35,000
Balance (in shares) at Sep. 30, 2019	13,004,507
Balance at Sep. 30, 2019	$ 130,000	1,058,000	32,055,000	33,243,000
Balance (in shares) at Dec. 31, 2019	12,885,273				12,885,273	[1]
Balance at Dec. 31, 2019	$ 129,000	708,000	32,390,000	33,227,000	$ 33,227,000	[2]
Net income			5,341,000	5,341,000
Common stock repurchased and retired (in shares)	(35,100)
Common stock repurchased and retired		(125,000)		(125,000)
Stock-based compensation expense		91,000		91,000
Options exercised (in shares)	712,839
Options exercised	$ 7,000	1,834,000		1,841,000
Balance (in shares) at Mar. 31, 2020	13,563,012
Balance at Mar. 31, 2020	$ 136,000	2,508,000	37,731,000	40,375,000
Balance (in shares) at Dec. 31, 2019	12,885,273				12,885,273	[1]
Balance at Dec. 31, 2019	$ 129,000	708,000	32,390,000	33,227,000	$ 33,227,000	[2]
Net income					$ 19,668,000
Options exercised (in shares)					747,674
Balance (in shares) at Sep. 30, 2020	13,577,847				13,577,847
Balance at Sep. 30, 2020	$ 136,000	2,539,000	52,058,000	54,733,000	$ 54,733,000
Balance (in shares) at Mar. 31, 2020	13,563,012
Balance at Mar. 31, 2020	$ 136,000	2,508,000	37,731,000	40,375,000
Net income			6,220,000	6,220,000
Common stock repurchased and retired (in shares)
Common stock repurchased and retired
Stock-based compensation expense		92,000		92,000
Options exercised (in shares)	24,835
Options exercised		94,000		94,000
Balance (in shares) at Jun. 30, 2020	13,587,847
Balance at Jun. 30, 2020	$ 136,000	2,694,000	43,951,000	46,781,000
Net income			8,107,000	8,107,000	$ 8,107,000
Common stock repurchased and retired (in shares)	(20,000)
Common stock repurchased and retired		(281,000)		(281,000)
Stock-based compensation expense		91,000		91,000
Options exercised (in shares)	10,000
Options exercised		35,000		35,000
Balance (in shares) at Sep. 30, 2020	13,577,847				13,577,847
Balance at Sep. 30, 2020	$ 136,000	$ 2,539,000	$ 52,058,000	$ 54,733,000	$ 54,733,000

[1] The condensed consolidated balance sheet as of December 31, 2019 has been prepared using information from the audited consolidated balance sheet as of that date.

[2] The condensed consolidated balance sheet as of December 31, 2019 has been prepared using information from the audited consolidated balance sheet as of that date.