Note 6 - Revolving Line of Credit and Long-term Debt (Details Textual) - Senior Secured Credit Facility [Member] - USD ($)		3 Months Ended
Jun. 22, 2020	Jun. 30, 2020
Debt Instrument, Face Amount	$ 65,000,000
Debt Instrument, Interest Rate, Effective Percentage		4.20%
Debt Issuance Costs, Net, Total	$ 1,800,000
Debt Instrument, Collateral, Percentage of Stock of Domestic Subsidiaries	100.00%
Interest Expense, Debt, Total		$ 66,000
Term Loan [Member]
Debt Instrument, Face Amount	$ 40,000,000
Debt Instrument, Term (Year)	5 years	5 years
Debt Instrument, Interest Rate, Effective Percentage		3.50%
Term Loan [Member] \| Minimum [Member]
Debt Instrument, Periodic Payment, Total	$ 500,000
Term Loan [Member] \| Maximum [Member]
Debt Instrument, Periodic Payment, Total	$ 1,000,000.0
Term Loan [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Term Loan [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Term Loan [Member] \| Eurodollar [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Term Loan [Member] \| Eurodollar [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Term Loan [Member] \| Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000,000
Debt Instrument, Term (Year)	5 years
Revolving Credit Facility [Member] \| Other Assets [Member]
Debt Issuance Costs, Line of Credit Arrangements, Net, Total	$ 700,000

The percentage of stock of domestic subsidiaries that is collateral for debt instrument.

No definition available.

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- 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

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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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.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

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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

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- Definition

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

+ References

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- 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

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