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Represents the maximum borrowing capacity under the credit facility as a percentage of the book value of eligible inventories.

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Represents the maximum borrowing capacity under the credit facility as a percentage of the book value of eligible mortgage property.

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Represents the maximum borrowing capacity under the credit facility as a percentage of the orderly liquidation value of eligible machinery and equipment.

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Extended period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payments on the derivative liability.

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The carrying value as of the balance sheet date of the current and noncurrent portions 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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Note 7 - Debt and Credit Agreements (Details Textual) - USD ($) $ in Thousands						3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 29, 2020	May 13, 2020	Apr. 15, 2020	Feb. 25, 2019	Oct. 26, 2016	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2016
Long-term Debt, Total						$ 228		$ 228		$ 228
Long-term Debt, Current Maturities, Total						6,392		6,392		1,406
Gain (Loss) on Extinguishment of Debt, Total						9,151	$ 0	9,151	$ 0
Development Corporation of Abilene Loan [Member]
Long-term Debt, Total										228				$ 570
Debt Instrument, Decrease, Forgiveness										114	$ 114	$ 114
Notes Payable, Other Payables [Member]
Long-term Debt, Total						392		392		163
Long-term Debt, Current Maturities, Total						$ 392		$ 392		161
Debt Instrument, Interest Rate, Stated Percentage						8.00%		8.00%
Paycheck Protection Program CARES Act [Member]
Long-term Debt, Total						$ 0		$ 0		$ 9,151
Proceeds from Issuance of Long-term Debt, Total			$ 9,530
Repayments of Long-term Debt, Total		$ 379
Gain (Loss) on Extinguishment of Debt, Total						9,151
Interest Rate Swap [Member]
Derivative Liability, Notional Amount													$ 6,000
Derivative, Fixed Interest Rate													2.13%
Minimum [Member] \| Notes Payable, Other Payables [Member]
Debt Instrument, Periodic Payment, Total								1
Maximum [Member] \| Notes Payable, Other Payables [Member]
Debt Instrument, Periodic Payment, Total								7
Revolving Credit Facility [Member]
Debt Instrument, Term (Year)					3 years
Long Term Debt Extended Term (Year)				3 years
Line of Credit Facility, Maximum Borrowing Capacity				$ 35,000
Line of Credit Facility Borrowing Restriction Percentage of Receivables				85.00%
Line of Credit Facility Borrowing Restriction Percentage of Inventories				50.00%
Line of Credit Facility Borrowing Restriction Percentage of Orderly Liquidation Value of Inventories				85.00%
Line of Credit Facility Borrowing Minimum Restriction Value				$ 12,500
Line of Credit Facility Borrowing Restriction Percentage of Orderly Liquidation Value of Machinery and Equipment				75.00%
Line of Credit Facility Borrowing Restriction Percentage of Mortgaged Property				50.00%
Line of Credit Facility Borrowing Restriction Value				$ 12,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage				0.50%
Long-term Line of Credit, Total						6,000		6,000
Line of Credit Facility, Remaining Borrowing Capacity						$ 18,928		$ 18,928
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 10,000
Letter of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Letter of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Letter of Credit [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Letter of Credit [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%