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
Common stock repurchased and retired (in shares)	255,000
Common stock repurchased and retired	$ 2,000	1,006,000		1,008,000
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					$ 2,228,000
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
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	$ 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
Common stock repurchased and retired (in shares)	172,000
Common stock repurchased and retired	$ 2,000	626,000		628,000
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
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
Common stock repurchased and retired (in shares)	35,100
Common stock repurchased and retired		125,000		125,000
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					$ 11,561,000
Options exercised (in shares)					737,674
Balance (in shares) at Jun. 30, 2020	13,587,847				13,563,012
Balance at Jun. 30, 2020	$ 136,000	2,694,000	43,951,000	46,781,000	$ 46,781,000
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	$ 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
Common stock repurchased and retired (in shares)
Common stock repurchased and retired
Balance (in shares) at Jun. 30, 2020	13,587,847				13,563,012
Balance at Jun. 30, 2020	$ 136,000	$ 2,694,000	$ 43,951,000	$ 46,781,000	$ 46,781,000

[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.