Current report filing

Document And Entity Information

Document And Entity Information
Oct. 29, 2019
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Oct. 29, 2019
Entity Incorporation, State or Country Code MN
Entity File Number 0-17272
Entity Tax Identification Number 41-1427402
Entity Address, Address Line One 614 McKinley Place NE
Entity Address, City or Town Minneapolis
Entity Address, State or Province MN
Entity Address, Postal Zip Code 55413
City Area Code 612
Local Phone Number 379-8854
Title of 12(b) Security Common Stock
Trading Symbol TECH
Security Exchange Name NASDAQ
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000842023