Note 4 - Financing Arrangements (Details Textual) - Credit Agreement [Member]	6 Months Ended	12 Months Ended
Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 15, 2017 USD ($)
Bank of America [Member]
Debt Issuance Costs, Net, Total	$ 50,000	$ 58,000
Bank of America [Member]
Long-Term Line of Credit, Total	$ 11,410,000	$ 9,016,000
Line of Credit, Minimum Fixed Charge Coverage Ratio During the Period	1.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 4,190
Bank of America [Member] \| Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 16,000,000
Debt Instrument, Interest Rate During Period	3.90%	3.50%

Represents line of credit minimum fixed charge coverage ratio during the period.

No definition available.

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- Definition

The average effective interest rate during the reporting period.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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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
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+ Details

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Balance Type:	credit
Period Type:	instant

- 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

+ 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

+ Details

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- Details

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