Restatement of Previously Issued Financial Statements - Balance Sheets (Details) $ / shares in Units, shares in Thousands, $ in Thousands	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares
Current assets
Cash and cash equivalents	$ 1,616	$ 2,142	$ 1,029
Trade receivables, net	85,209	108,381	86,268
Inventory	90,572	109,806	121,472
Prepaid expenses and other current assets	13,358	11,345	16,412
Current assets of discontinued operations	0	5,383	21,255
Total current assets	190,755	237,057	246,436
Property, plant and equipment, net	23,064	22,324	21,649
Goodwill	6,253	6,253	6,253
Other intangible assets, net	2,494	3,141	3,828
Deferred income taxes	5,830	6,248	3,754
Deferred costs	11,532	10,941	8,564
Other non-current assets	2,673	2,085	1,984
Non-current assets of discontinued operations	0	614	4,420
Total assets	242,601	288,663	296,888
Current liabilities
Accounts payable	92,282	111,348	86,199
Accounts payable to NACCO Industries, Inc.	496	496	220
Revolving credit agreements	41,785	23,497	51,505
Accrued compensation	11,362	15,027	11,725
Accrued product returns	7,383	8,697	8,224
Other current liabilities	15,242	12,534	21,382
Current liabilities of discontinued operations	0	29,723	20,048
Total current liabilities	168,550	201,322	199,303
Revolving credit agreements	0	35,000	30,000
Other long-term liabilities	12,499	16,075	14,699
Total liabilities	181,049	252,397	247,699
Stockholders' equity
Preferred stock, par value $0.01 per share		0
Capital in excess of par value	56,325	54,509	53,342
Treasury stock	(5,960)	(5,960)	(2,334)
Retained earnings	30,528	3,710	15,646
Accumulated other comprehensive loss	(19,481)	(16,132)	(17,604)
Total stockholders' equity	61,552	36,266	49,189
Total liabilities and stockholders' equity	$ 242,601	$ 288,663	$ 296,888
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01
Non-current liabilities of discontinued operations	$ 0	$ 0	$ 3,697
Class A Common Stock
Stockholders' equity
Common stock	$ 99	$ 98	$ 95
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued (in shares) | shares	9,946	9,805	9,469
Class B Common Stock
Stockholders' equity
Common stock	$ 41	$ 41	$ 44
Capital in excess of par value			53,342
Treasury stock			$ (2,334)
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued (in shares) | shares	4,063	4,076	4,383
Common stock, convertible conversion ratio	1	1	1
As Previously Reported
Current assets
Cash and cash equivalents		$ 2,142	$ 1,131
Trade receivables, net		113,781	89,579
Inventory		109,621	140,817
Prepaid expenses and other current assets		23,102	24,078
Current assets of discontinued operations		5,383	0
Total current assets		254,029	255,605
Property, plant and equipment, net		22,324	23,204
Goodwill		6,253	6,253
Other intangible assets, net		3,141	3,828
Deferred income taxes		3,853	6,169
Deferred costs		10,941	8,683
Other non-current assets		2,085	1,997
Non-current assets of discontinued operations		614	0
Total assets		303,240	305,739
Current liabilities
Accounts payable		111,117	91,737
Accounts payable to NACCO Industries, Inc.		496	220
Revolving credit agreements		23,497	58,955
Accrued compensation		14,277	12,091
Accrued product returns		8,697	8,224
Other current liabilities		12,873	27,930
Current liabilities of discontinued operations		29,723	0
Total current liabilities		200,680	199,157
Revolving credit agreements		35,000	32,000
Other long-term liabilities		12,501	15,485
Total liabilities		248,181	246,642
Stockholders' equity
Preferred stock, par value $0.01 per share		0
Capital in excess of par value		54,344
Treasury stock		(5,960)
Retained earnings		22,524	25,773
Accumulated other comprehensive loss		(15,988)	(17,823)
Total stockholders' equity		55,059	59,097
Total liabilities and stockholders' equity		$ 303,240	305,739
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01
Non-current liabilities of discontinued operations			0
As Previously Reported | Class A Common Stock
Stockholders' equity
Common stock		$ 98	95
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Common stock, shares issued (in shares) | shares		9,805
As Previously Reported | Class B Common Stock
Stockholders' equity
Common stock		$ 41	44
Capital in excess of par value			53,342
Treasury stock			(2,334)
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Common stock, shares issued (in shares) | shares		4,076
Common stock, convertible conversion ratio		1
Restatement Impacts
Current assets
Cash and cash equivalents		$ 0	0
Trade receivables, net		(5,400)	(2,446)
Inventory		185	0
Prepaid expenses and other current assets		(11,757)	(6,723)
Current assets of discontinued operations		0	0
Total current assets		(16,972)	(9,169)
Property, plant and equipment, net		0	0
Goodwill		0	0
Other intangible assets, net		0	0
Deferred income taxes		2,395	318
Deferred costs		0	0
Other non-current assets		0	0
Non-current assets of discontinued operations		0	0
Total assets		(14,577)	(8,851)
Current liabilities
Accounts payable		231	0
Accounts payable to NACCO Industries, Inc.		0	0
Revolving credit agreements		0	0
Accrued compensation		750	387
Accrued product returns		0	0
Other current liabilities		(339)	(241)
Current liabilities of discontinued operations		0	0
Total current liabilities		642	146
Revolving credit agreements		0	0
Other long-term liabilities		3,574	911
Total liabilities		4,216	1,057
Stockholders' equity
Preferred stock, par value $0.01 per share		0
Capital in excess of par value		165
Treasury stock		0
Retained earnings		(18,814)	(10,127)
Accumulated other comprehensive loss		(144)	219
Total stockholders' equity		(18,793)	(9,908)
Total liabilities and stockholders' equity		$ (14,577)	(8,851)
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01
Non-current liabilities of discontinued operations			0
Restatement Impacts | Class A Common Stock
Stockholders' equity
Common stock		$ 0	0
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Common stock, shares issued (in shares) | shares		9,805
Restatement Impacts | Class B Common Stock
Stockholders' equity
Common stock		$ 0	0
Capital in excess of par value			0
Treasury stock			0
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Common stock, shares issued (in shares) | shares		4,076
Common stock, convertible conversion ratio		1
As Restated
Current assets
Cash and cash equivalents			1,131
Trade receivables, net			87,133
Inventory			140,817
Prepaid expenses and other current assets			17,355
Current assets of discontinued operations			0
Total current assets			246,436
Property, plant and equipment, net			23,204
Goodwill			6,253
Other intangible assets, net			3,828
Deferred income taxes			6,487
Deferred costs			8,683
Other non-current assets			1,997
Non-current assets of discontinued operations			0
Total assets			296,888
Current liabilities
Accounts payable			91,737
Accounts payable to NACCO Industries, Inc.			220
Revolving credit agreements			58,955
Accrued compensation			12,478
Accrued product returns			8,224
Other current liabilities			27,689
Current liabilities of discontinued operations			0
Total current liabilities			199,303
Revolving credit agreements			32,000
Other long-term liabilities			16,396
Total liabilities			247,699
Stockholders' equity
Retained earnings			15,646
Accumulated other comprehensive loss			(17,604)
Total stockholders' equity			49,189
Total liabilities and stockholders' equity			296,888
Non-current liabilities of discontinued operations			0
As Restated | Class A Common Stock
Stockholders' equity
Common stock			95
As Restated | Class B Common Stock
Stockholders' equity
Common stock			44
Capital in excess of par value			53,342
Treasury stock			(2,334)
Recasting Impacts
Current assets
Cash and cash equivalents			(102)
Trade receivables, net			(865)
Inventory			(19,345)
Prepaid expenses and other current assets			(943)
Current assets of discontinued operations			21,255
Total current assets			0
Property, plant and equipment, net			(1,555)
Goodwill			0
Other intangible assets, net			0
Deferred income taxes			(2,733)
Deferred costs			(119)
Other non-current assets			(13)
Non-current assets of discontinued operations			4,420
Total assets			0
Current liabilities
Accounts payable			(5,538)
Accounts payable to NACCO Industries, Inc.			0
Revolving credit agreements			(7,450)
Accrued compensation			(753)
Accrued product returns			0
Other current liabilities			(6,307)
Current liabilities of discontinued operations			20,048
Total current liabilities			0
Revolving credit agreements			(2,000)
Other long-term liabilities			(1,697)
Total liabilities			0
Stockholders' equity
Retained earnings			0
Accumulated other comprehensive loss			0
Total stockholders' equity			0
Total liabilities and stockholders' equity			0
Non-current liabilities of discontinued operations			3,697
Recasting Impacts | Class A Common Stock
Stockholders' equity
Common stock			0
Recasting Impacts | Class B Common Stock
Stockholders' equity
Common stock			0
Capital in excess of par value			0
Treasury stock			$ 0