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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% |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the maximum borrowing capacity under the credit facility as a percentage of the orderly liquidation value of eligible inventories. + References No definition available. + Details
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- Definition Represents the maximum borrowing capacity under the credit facility as a percentage of the orderly liquidation value of eligible machinery and equipment. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Decrease for amounts of indebtedness forgiven by the holder of the debt instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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