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Note 10 - Loan and Credit Agreements (Details Textual) |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2020 USD ($) | Jun. 24, 2020 | Jun. 18, 2020 USD ($) | Apr. 20, 2020 USD ($) | Feb. 13, 2019 USD ($) | Sep. 28, 2017 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | May 01, 2010 USD ($)
Long-term Debt, Total |  |  |  |  |  |  | $ 3,636,403 |  | $ 2,435,993 |
Proceeds from Paycheck Protection Program Under CARES Act |  |  |  | $ 1,242,900 |  |  | 1,242,900 |  |  |
Term Loan Due October 2037 [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  | $ 2,393,503 |  | $ 2,435,993 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.00% |  | 5.00% |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  | $ 17,271 |  | $ 17,271 |
EIDL Assistance Program, Loan One [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  | $ 731 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 150,000 |  |  |  |  |  |  |
EIDL Assistance Program, Loan Two [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  | 731 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 150,000 |  |  |  |  |  |  |
EIDL Assistance Program, Loan Three [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total | $ 731 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 150,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Date of First Required Payment | Jun. 24, 2021 |  |  |  |  |  |  |  |  |
Economic Injury Distaster Loan Assistance Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 30 years |  |  |  |  |  |  |  |
EIDL Assistance Program, Loans One and Two [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Date of First Required Payment |  |  | Jun. 18, 2021 |  |  |  |  |  |  |
Bank Midwest [Member] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Total |  |  |  |  |  |  | 3,130,530 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  | $ 1,869,470 |  |  |
Line of Credit, Borrowing Base, Accounts Receivable |  |  |  |  |  |  | 75.00% |  |  |
Line of Credit, Borrowing Base, Inventory |  |  |  |  |  |  | 50.00% |  |  |
Debt Instrument, Covenant, Minimum Working Capital Ratio |  |  |  |  |  | 1.75 |  |  |  |
Debt Instrument, Covenant, Minimum Working Capital |  |  |  |  |  | $ 5,100,000 |  |  |  |
Debt Instrument, Covenant, Maximum Debt to Worth Ratio |  |  |  |  |  | 1 |  |  |  |
Debt Instrument, Covenant, Minimum Tangible Balance Sheet Equity, Percentage |  |  |  |  |  | 40.00% |  |  |  |
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio |  |  |  |  |  | 1.25 |  |  |  |
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio, Tolerance |  |  |  |  |  | 0.1 |  |  |  |
Debt Instrument, Covenant, Annual Purchases or Sales Price of Equipment Before Requiring Bank Approval |  |  |  |  |  | $ 100,000 |  |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | 2,600,000 |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  | $ 17,271 |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | United States Department of Agriculture [Member] |  |  |  |  |  |  |  |  |  |
Upfront Guarantee Fee |  |  |  |  |  |  | $ 62,400 |  |  |
Guarantee Fee, Annual Fee, Percentage |  |  |  |  |  |  | 0.50% |  |  |
Guarantee Requirement, Personally Guarantee, Shareholders Ownership Percentage |  |  |  |  |  |  | 20.00% |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | J. Ward McConnell Jr. [Member] |  |  |  |  |  |  |  |  |  |
Personally Guaranteed, Percentage of Loan |  |  |  |  |  |  | 38.00% |  |  |
Personally Guaranteed, Fee, Percentage of Guaranteed Amount |  |  |  |  |  |  | 2.00% |  |  |
Bank Midwest [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 5,000,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  |  | 4.25% |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 4.25% |  |  |  |  |
Bank Midwest [Member] | Revolving Credit Facility [Member] | Wall Street Journal Rate [Member] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 4,000,000 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 1.00% |  |  |
Line of Credit Facility, Interest Rate During Period |  |  |  |  |  |  | 4.25% |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.00% |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 4.15% |  |  |
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | Wall Street Journal Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 0.75% |  |  |
The First National Bank of West Union [Member] | Iowa Finance Authority Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 1,300,000

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- Definition The maximum value of purchases or sales of equipment allowed, annually, before the company must receive bank approval that is required to maintain pursuant to the debt agreement. + References No definition available. + Details
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- Definition 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. + References No definition available. + 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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