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Note 3 - Selected Balance Sheet Data (Details Textual) - USD ($) | Mar. 31, 2020 | Jun. 30, 2019
--- | --- | ---
Other Noncurrent Assets [Member] |  |
Inventory, Finished Goods, Net of Reserves, Non-current | $ 3,649 | $ 3,239,000

X
- Definition Non-current amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. + References No definition available. + Details
Name: | tech_InventoryFinishedGoodsNetOfReservesNonCurrent
Namespace Prefix: | tech_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |