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Face amount or stated value per share of common stock.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)				1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 11, 2020	Jul. 21, 2020	Jun. 22, 2020	Jul. 21, 2020	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020	Jan. 03, 2021	May 06, 2020
Restructuring Charges, Total					$ 0	$ 34,000	$ 0	$ 513,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance					18,996,000		18,996,000		$ 22,748,000
Line of Credit, Current					15,000,000		15,000,000		15,000,000
Notes Payable, Noncurrent, Total					$ 0		$ 0		$ 1,192,000
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001		$ 0.001		$ 0.001
Underwritten Public Offering [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						2,500,000
Common Stock [Member] \| Underwritten Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)			2,500,000
Shares Issued, Price Per Share (in dollars per share)			$ 3.50
Proceeds from Issuance of Common Stock			$ 8,800,000	$ 9,300,000
Payments of Stock Issuance Costs			$ 1,100,000	1,200,000
Proceeds from Issuance of Common Stock, Net				$ 8,100,000
Common Stock [Member] \| Exercise of Option for Overallotment of Shares by Underwriters [Member]
Stock Issued During Period, Shares, New Issues (in shares)		141,733	375,000
Proceeds from Issuance of Common Stock		$ 496,000
Payments of Stock Issuance Costs		$ 52,000
Heritage Bank of Commerce [Member] \| Paycheck Protection Program [Member]
Notes Payable, Noncurrent, Total					$ 1,200,000		$ 1,200,000
Debt Instrument, Face Amount										$ 1,200,000
Heritage Bank of Commerce [Member] \| Revolving Credit Facility [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance					19,000,000.0		19,000,000.0
Line of Credit, Current					$ 15,000,000.0		$ 15,000,000.0		$ 15,000,000.0
Line of Credit Facility, Expiration Period (Year)	1 year
Debt Instrument, Interest Rate, Effective Percentage					3.75%		3.75%		3.75%
Heritage Bank of Commerce [Member] \| Revolving Credit Facility [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%