The annual expected amortization expense over the remainder of the debt term.

No definition available.

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- Definition

Represents debt service coverage ratio that needs to be maintained by the company under covenant agreement.

+ References

No definition available.

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- Definition

Represents the amount of the Tax Exempt Industrial Revenue Bonds issued to the Bank.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Balance Type:	na
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- Definition

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

+ References

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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- Definition

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

+ References

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- Definition

Sum of investments and unrestricted cash as of the balance sheet date.

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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.

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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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Note 8 - Long-term Debt (Details Textual)		12 Months Ended
Note 8 - Long-term Debt (Details Textual)	Apr. 29, 2016 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 01, 2016 USD ($)
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,050,000
Long-term Line of Credit, Total		$ 0	$ 0
Line of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.80%
Loan [Member]
Debt Instrument, Periodic Payment, Total	$ 18,000
Debt Instrument, Interest Rate, Stated Percentage	2.60%
Debt Issuance Costs, Gross	$ 139,000
Debt Instrument, Interest Rate, Effective Percentage	3.23%
Debt Service Coverage Ratio	1.25
Investments and Cash, Total		$ 3,200,000
Amortization of Debt Issuance Costs		11,000	12,000
Debt Issuance Costs, Noncurrent, Net, Total		85,000	$ 11,000
Amortization of Debt Issuance Costs Annual Expected Amount Over Remainder of Debt Term		$ 10,000
Loan [Member] \| Building [Member]
Area of Real Estate Property \| ft²	27,300
Duluth Economic Development Authority [Member]
Tax Exempt Industrial Revenue Bonds Amount Sold to Bank				$ 3,415,000