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

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- 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.

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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Note 8 - Bank Debt (Details Textual) - USD ($)		6 Months Ended
Note 8 - Bank Debt (Details Textual) - USD ($)	Jul. 05, 2018	Jun. 30, 2021	Mar. 02, 2021	Dec. 31, 2020	Dec. 30, 2019	Sep. 30, 2019
Line of Credit Facility, Maximum Borrowing Capacity		$ 14,300,000		$ 9,200,000
J P Morgan Chase Bank [Member] \| Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,000,000
J P Morgan Chase Bank [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Commitment Fee Percentage	0.25%
J P Morgan Chase Bank [Member] \| Revolving Credit Facility [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
J P Morgan Chase Bank [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
J P Morgan Chase Bank [Member] \| Term Debt [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 30,000,000		$ 30,000,000	$ 20,000,000
Long-term Debt, Total			$ 6,000,000
Debt Instrument, Periodic Payment, Total		$ 111,111
J P Morgan Chase Bank [Member] \| Term Debt [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
J P Morgan Chase Bank [Member] \| Term Debt [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%