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Note F - Long-term Debt (Details Textual) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Dec. 21, 2021	Apr. 17, 2017	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021
Letters of Credit Outstanding, Amount			$ 800
Proceeds from Lines of Credit, Total			0
Interest Expense, Debt			$ 138	$ 97
Texas Capital Bank [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.25%
Debt Instrument, Interest Rate, Effective Percentage			6.81%
Revolving Credit Facility [Member] | Bloomberg Short-Term Bank Yield Index Rate [Member] | Texas Capital Bank [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
New Credit Facility [Member]
Long-Term Line of Credit, Total			$ 0
New Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 24,200
New Credit Facility [Member] | Revolving Credit Facility [Member] | Texas Capital Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Debt Instrument, Term (Year)	3 years
Texas Capital Credit Facility [Member]
Long-Term Line of Credit, Total					$ 5,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Line of Credit Facility, Collateral Fees, Percentage		0.50%
Repayments of Long-term Lines of Credit					$ 12,100
Texas Capital Credit Facility [Member] | London Interbank Offered Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		1.95%
Texas Capital Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.75%
Texas Capital Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 20,000
Texas Capital Credit Facility [Member] | Standby Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 5,000

X

- Definition

Percentage of the fees associated with providing collateral for the credit facility.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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X

- 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.

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X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- 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.

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X

- 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.

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X

- Definition

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

+ References

No definition available.

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X

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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X

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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