Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 2,142	$ 1,559	$ 1,029	$ 1,636	$ 4,420	$ 1,567	$ 1,393	$ 1,784
Trade receivables, net	108,381	103,091	86,268	79,102	98,361	112,309	76,132	79,358
Inventory	109,806	161,043	121,472	120,707	122,808	155,744	138,721	132,749
Prepaid expenses and other current assets	11,345	14,086	16,412	17,379	15,396	12,595	14,569	14,615
Current assets of discontinued operations	5,383	22,830	21,255	24,692	27,879	32,185	30,704	29,086
Total current assets	237,057	302,609	246,436	243,516	268,864	314,400	261,519	257,592
Property, plant and equipment, net	22,324	22,193	21,649	20,984	20,842	20,988	19,088	17,643	$ 15,979
Goodwill	6,253	6,253	6,253	6,253	6,253	6,253	6,253	6,253
Other intangible assets, net	3,141	3,483	3,828	4,174	4,519	4,864	5,209	5,555
Deferred income taxes	6,248	5,640	3,754	3,166	5,794	7,704	8,877	10,419
Deferred costs	10,941	8,804	8,564	8,316	7,868	10,153	9,825	10,187
Other non-current assets	2,085	1,553	1,984	2,403	2,672	3,282	3,178	3,068
Non-current assets of discontinued operations	614	1,744	4,420	4,446	4,606	5,313	5,688	5,661
Total assets	288,663	352,279	296,888	293,258	321,418	372,957	319,637	316,378
Current liabilities
Accounts payable	111,348	140,011	86,199	73,720	119,271	131,620	92,488	96,924
Accounts payable to NACCO Industries, Inc.	496	220	220	2,425	2,416	2,480	2,769	7,814
Revolving credit agreements	23,497	50,152	51,505	54,812	11,624	60,083	66,326	63,308
Accrued compensation	15,027	14,650	11,725	8,398	15,878	15,421	11,984	9,238
Accrued product returns	8,697	8,266	8,224	9,314	10,698	9,601	9,648	10,815
Other current liabilities	12,534	25,880	21,382	17,705	22,922	22,488	15,769	21,227
Current liabilities of discontinued operations	29,723	24,713	20,048	21,473	22,820	29,693	26,830	21,509
Total current liabilities	201,322	263,892	199,303	187,847	205,629	271,386	225,814	230,835
Revolving credit agreements	35,000	30,000	30,000	30,000	35,000	30,000	30,000	20,000
Other long-term liabilities	16,075	14,258	14,699	18,619	22,011	22,343	21,654	21,831
Non-current liabilities of discontinued operations	0	1,585	3,697	3,834	1,960	2,293	2,416	2,565
Total liabilities	252,397	309,735	247,699	240,300	264,600	326,022	279,884	275,231
Stockholders’ equity
Preferred stock, par value $0.01 per share	0				0
Capital in excess of par value	54,509				51,714
Treasury stock	(5,960)	(5,960)	(2,334)	0	0	0	0	0
Retained earnings	3,710	12,231	15,646	17,506	22,068	9,373	3,397	5,683
Accumulated other comprehensive loss	(16,132)	(18,009)	(17,604)	(17,207)	(17,101)	(13,941)	(14,502)	(13,724)
Total stockholders’ equity	36,266	42,544	49,189	52,958	56,818	46,935	39,753	41,147
Total liabilities and stockholders' equity	288,663	352,279	296,888	293,258	321,418	372,957	319,637	316,378
Class A Common stock, par value $0.01 per share; 9,805 and 9,291 shares issued as of December 31, 2019 and 2018, respectively
Stockholders’ equity
Common stock	98	95	95	95	93	92	92	92
Class B Common stock, par value $0.01 per share, convertible into Class A on a one-for-one basis; 4,076 and 4,422 shares issued as of December 31, 2019 and 2018, respectively
Stockholders’ equity
Common stock	$ 41	44	44	44	$ 44	45	45	45
Capital in excess of par value		$ 54,143	$ 53,342	$ 52,520		$ 51,366	$ 50,721	$ 49,051