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Document and Entity Information | 12 Months Ended
--- | ---
Dec. 31, 2021
Document and Entity Information [Abstract] |
Entity Central Index Key | 0000842517
Amendment Flag | false
Document Fiscal Year Focus | 2021
Document Fiscal Period Focus | FY
Current Fiscal Year End Date | --12-31
Auditor Name | Rehmann Robson LLC
Auditor Location | Saginaw, Michigan
Auditor Firm ID | 263

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