Restatement of Previously Issued Financial Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating activities
Net income (loss) from continuing operations	$ 8,065	$ 1,898	$ 6,711	$ 1,236
Adjustments to reconcile net income (loss) from continuing operations to net cash used for operating activities:
Depreciation and amortization			1,486	1,841
Deferred income taxes			1,037	1,900
Stock compensation expense			1,817	1,629
Other			116	77
Net changes in operating assets and liabilities:
Affiliate payable			0	(2,195)
Trade receivables			19,079	12,922
Inventory			17,222	1,936
Other assets			(1,462)	(1,602)
Accounts payable			(18,871)	(33,102)
Other liabilities			(5,383)	(16,288)
Net cash provided by (used for) operating activities from continuing operations			21,752	(31,646)
Investing activities
Expenditures for property, plant and equipment			(1,592)	(1,972)
Other			(500)	0
Net cash used for investing activities from continuing operations			(2,092)	(1,972)
Financing activities
Net additions (reductions) to revolving credit agreements			(16,692)	34,852
Purchase of treasury stock			0	(2,334)
Cash dividends paid			(2,454)	(2,419)
Net cash provided by (used for) financing activities from continuing operations			(19,146)	30,099
Cash flows from discontinued operations
Net cash used for operating activities from discontinued operations			(6,193)	(10,443)
Net cash provided by investing activities from discontinued operations			6	(83)
Net cash provided by financing activities from discontinued operations			0	9,450
Cash used for discontinued operations			(6,187)	(1,076)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			1,079	(626)
Cash, cash equivalents and restricted cash
(Decrease) increase for the year from continuing operations			1,593	(4,145)
Increase (decrease) for the year from discontinued operations			(6,187)	(1,076)
Balance at the beginning of the period			7,164	6,352	$ 6,352
Balance at the end of the period	$ 2,570	1,131	$ 2,570	1,131	7,164
As Previously Reported
Operating activities
Net income (loss) from continuing operations		(944)		(2,705)
Adjustments to reconcile net income (loss) from continuing operations to net cash used for operating activities:
Depreciation and amortization				2,153
Deferred income taxes				1,800
Stock compensation expense				1,629
Other				117
Net changes in operating assets and liabilities:
Affiliate payable				(2,199)
Trade receivables				13,956
Inventory				4,375
Other assets				(133)
Accounts payable				(41,259)
Other liabilities				(19,841)
Net cash provided by (used for) operating activities from continuing operations				(42,107)
Investing activities
Expenditures for property, plant and equipment				(2,091)
Other				36
Net cash used for investing activities from continuing operations				(2,055)
Financing activities
Net additions (reductions) to revolving credit agreements				44,302
Purchase of treasury stock				(2,334)
Cash dividends paid				(2,419)
Net cash provided by (used for) financing activities from continuing operations				39,549
Cash flows from discontinued operations
Net cash used for operating activities from discontinued operations				0
Net cash provided by investing activities from discontinued operations				0
Net cash provided by financing activities from discontinued operations				0
Cash used for discontinued operations				0
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				(608)
Cash, cash equivalents and restricted cash
(Decrease) increase for the year from continuing operations				(5,221)
Increase (decrease) for the year from discontinued operations				0
Balance at the beginning of the period				6,352	6,352
Balance at the end of the period		1,131		1,131
Restatement Impacts
Operating activities
Net income (loss) from continuing operations		326		(1,298)
Adjustments to reconcile net income (loss) from continuing operations to net cash used for operating activities:
Depreciation and amortization				0
Deferred income taxes				57
Stock compensation expense				0
Other				(11)
Net changes in operating assets and liabilities:
Affiliate payable				(1)
Trade receivables				(128)
Inventory				210
Other assets				(214)
Accounts payable				(9)
Other liabilities				1,412
Net cash provided by (used for) operating activities from continuing operations				18
Investing activities
Expenditures for property, plant and equipment				0
Other				0
Net cash used for investing activities from continuing operations				0
Financing activities
Net additions (reductions) to revolving credit agreements				0
Purchase of treasury stock				0
Cash dividends paid				0
Net cash provided by (used for) financing activities from continuing operations				0
Cash flows from discontinued operations
Net cash used for operating activities from discontinued operations				0
Net cash provided by investing activities from discontinued operations				0
Net cash provided by financing activities from discontinued operations				0
Cash used for discontinued operations				0
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				(18)
Cash, cash equivalents and restricted cash
(Decrease) increase for the year from continuing operations				0
Increase (decrease) for the year from discontinued operations				0
Balance at the beginning of the period				0	0
Balance at the end of the period		0		0
As Restated
Operating activities
Net income (loss) from continuing operations		(618)		(4,003)
Adjustments to reconcile net income (loss) from continuing operations to net cash used for operating activities:
Depreciation and amortization				2,153
Deferred income taxes				1,857
Stock compensation expense				1,629
Other				106
Net changes in operating assets and liabilities:
Affiliate payable				(2,200)
Trade receivables				13,828
Inventory				4,585
Other assets				(347)
Accounts payable				(41,268)
Other liabilities				(18,429)
Net cash provided by (used for) operating activities from continuing operations				(42,089)
Investing activities
Expenditures for property, plant and equipment				(2,091)
Other				36
Net cash used for investing activities from continuing operations				(2,055)
Financing activities
Net additions (reductions) to revolving credit agreements				44,302
Purchase of treasury stock				(2,334)
Cash dividends paid				(2,419)
Net cash provided by (used for) financing activities from continuing operations				39,549
Cash flows from discontinued operations
Net cash used for operating activities from discontinued operations				0
Net cash provided by investing activities from discontinued operations				0
Net cash provided by financing activities from discontinued operations				0
Cash used for discontinued operations				0
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				(626)
Cash, cash equivalents and restricted cash
(Decrease) increase for the year from continuing operations				(5,221)
Increase (decrease) for the year from discontinued operations				0
Balance at the beginning of the period				6,352	6,352
Balance at the end of the period		1,131		1,131
Recasting Impacts
Operating activities
Net income (loss) from continuing operations		2,516		5,239
Adjustments to reconcile net income (loss) from continuing operations to net cash used for operating activities:
Depreciation and amortization				(312)
Deferred income taxes				43
Stock compensation expense				0
Other				(29)
Net changes in operating assets and liabilities:
Affiliate payable				5
Trade receivables				(906)
Inventory				(2,649)
Other assets				(1,255)
Accounts payable				8,166
Other liabilities				2,141
Net cash provided by (used for) operating activities from continuing operations				10,443
Investing activities
Expenditures for property, plant and equipment				119
Other				(36)
Net cash used for investing activities from continuing operations				83
Financing activities
Net additions (reductions) to revolving credit agreements				(9,450)
Purchase of treasury stock				0
Cash dividends paid				0
Net cash provided by (used for) financing activities from continuing operations				(9,450)
Cash flows from discontinued operations
Net cash used for operating activities from discontinued operations				(10,443)
Net cash provided by investing activities from discontinued operations				(83)
Net cash provided by financing activities from discontinued operations				9,450
Cash used for discontinued operations				(1,076)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				0
Cash, cash equivalents and restricted cash
(Decrease) increase for the year from continuing operations				1,076
Increase (decrease) for the year from discontinued operations				(1,076)
Balance at the beginning of the period				0	$ 0
Balance at the end of the period		$ 0		$ 0