Capital Stock - Equity Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 28,305	$ 22,057	$ 15,407	$ 18,775	$ 21,785	$ 21,785
Purchases to cover stock compensation taxes	502	33	27	29	32
Ending Balance	$ 28,145	$ 18,931	$ 13,345	$ 15,407	$ 18,775	$ 22,057
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	113,283	113,283	113,283	105,285	105,285	105,285
Beginning Balance	$ (181)	$ (181)	$ (181)	$ (172)	$ (165)	$ (165)
Purchases to cover stock compensation taxes (in shares)						8,000
Purchases to cover stock compensation taxes						$ (16)
Ending Balance (in shares)	113,283	113,283	113,283	113,283	105,285	113,283
Ending Balance	$ (181)	$ (181)	$ (181)	$ (181)	$ (172)	$ (181)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details