Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2019	10,413,982
Balance at Dec. 31, 2019	$ 104	$ 26,256	$ 18,005	$ 673	$ (204)	$ 44,834
Net earnings (loss)	0	0	(1,143)	0	0	(1,143)
Other comprehensive earnings (loss)	0	0	0	(38)	0	(38)
Amortization of deferred compensation related to stock-based awards	$ 0	187	0	0	0	187
Issuance of unvested shares of restricted stock (in shares)	58,160
Issuance of unvested shares of restricted stock	$ 1	(1)	0	0	0	0
Forfeiture of unvested shares of restricted stock (in shares)	(8,315)
Forfeiture of unvested shares of restricted stock	$ 0		0	0	0	0
Forfeiture of unvested shares of restricted stock		0
Repurchase and retirement of common stock (in shares)	(13,767)
Repurchase and retirement of common stock	$ 0	(74)	0	0	0	(74)
Balance (in shares) at Mar. 31, 2020	10,450,060
Balance at Mar. 31, 2020	$ 105	26,368	16,862	635	(204)	43,766
Balance (in shares) at Dec. 31, 2019	10,413,982
Balance at Dec. 31, 2019	$ 104	26,256	18,005	673	(204)	44,834
Net earnings (loss)						(515)
Balance (in shares) at Sep. 30, 2020	10,562,200
Balance at Sep. 30, 2020	$ 106	26,660	17,490	771	(204)	44,823
Balance (in shares) at Mar. 31, 2020	10,450,060
Balance at Mar. 31, 2020	$ 105	26,368	16,862	635	(204)	43,766
Net earnings (loss)	0	0	170	0	0	170
Other comprehensive earnings (loss)	0	0	0	35	0	35
Amortization of deferred compensation related to stock-based awards	$ 0	208	0	0	0	208
Issuance of unvested shares of restricted stock (in shares)	15,840
Issuance of unvested shares of restricted stock	$ 0	0	0	0	0	0
Forfeiture of unvested shares of restricted stock (in shares)	(6,750)
Forfeiture of unvested shares of restricted stock	$ 0		0	0	0	0
Forfeiture of unvested shares of restricted stock		0
Balance (in shares) at Jun. 30, 2020	10,459,150
Balance at Jun. 30, 2020	$ 105	26,576	17,032	670	(204)	44,179
Net earnings (loss)	0	0	458	0	0	458
Other comprehensive earnings (loss)	0	0	0	101	0	101
Amortization of deferred compensation related to stock-based awards	$ 0	85	0	0	0	85
Issuance of unvested shares of restricted stock (in shares)	155,110
Issuance of unvested shares of restricted stock	$ 2	(2)	0	0	0	0
Forfeiture of unvested shares of restricted stock (in shares)	(52,060)
Forfeiture of unvested shares of restricted stock	$ (1)		0	0	0	0
Forfeiture of unvested shares of restricted stock		1
Balance (in shares) at Sep. 30, 2020	10,562,200
Balance at Sep. 30, 2020	$ 106	26,660	17,490	771	(204)	$ 44,823
Balance (in shares) at Dec. 31, 2020	10,562,200					10,562,200
Balance at Dec. 31, 2020	$ 106	26,851	17,110	889	(204)	$ 44,752
Net earnings (loss)	0	0	2,212	0	0	2,212
Other comprehensive earnings (loss)	0	0	0	(101)	0	(101)
Amortization of deferred compensation related to stock-based awards	$ 0	269	0	0	0	269
Issuance of unvested shares of restricted stock (in shares)	81,468
Issuance of unvested shares of restricted stock	$ 1	(1)	0	0	0	0
Stock options exercised (in shares)	99,740
Stock options exercised	$ 1	716	0	0	0	717
Balance (in shares) at Mar. 31, 2021	10,743,408
Balance at Mar. 31, 2021	$ 108	27,835	19,322	788	(204)	$ 47,849
Balance (in shares) at Dec. 31, 2020	10,562,200					10,562,200
Balance at Dec. 31, 2020	$ 106	26,851	17,110	889	(204)	$ 44,752
Net earnings (loss)						$ 6,996
Stock options exercised (in shares)						149,010
Balance (in shares) at Sep. 30, 2021	10,819,294					10,819,294
Balance at Sep. 30, 2021	$ 108	28,962	24,106	744	(204)	$ 53,716
Balance (in shares) at Mar. 31, 2021	10,743,408
Balance at Mar. 31, 2021	$ 108	27,835	19,322	788	(204)	47,849
Net earnings (loss)	0	0	2,609	0	0	2,609
Other comprehensive earnings (loss)	0	0	0	24	0	24
Amortization of deferred compensation related to stock-based awards	$ 0	454	0	0	0	454
Issuance of unvested shares of restricted stock (in shares)	44,741
Issuance of unvested shares of restricted stock	$ 0	0	0	0	0	0
Stock options exercised (in shares)	45,835
Stock options exercised	$ 0	285	0	0	0	285
Forfeiture of unvested shares of restricted stock (in shares)	(18,125)
Forfeiture of unvested shares of restricted stock	$ 0		0	0	0	0
Forfeiture of unvested shares of restricted stock		0
Balance (in shares) at Jun. 30, 2021	10,815,859
Balance at Jun. 30, 2021	$ 108	28,574	21,931	812	(204)	51,221
Net earnings (loss)	0	0	2,175	0	0	2,175
Other comprehensive earnings (loss)	0	0	0	(68)	0	(68)
Amortization of deferred compensation related to stock-based awards	$ 0	371	0	0	0	371
Stock options exercised (in shares)	3,435
Stock options exercised	$ 0	17	0	0	0	$ 17
Balance (in shares) at Sep. 30, 2021	10,819,294					10,819,294
Balance at Sep. 30, 2021	$ 108	$ 28,962	$ 24,106	$ 744	$ (204)	$ 53,716