Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Thousands	3 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Apr. 01, 2019
Cash, Uninsured Amount	$ 1,295,000
Contract with Customer, Liability, Revenue Recognized	93,715
Advertising Expense	6,636	$ 12,456
Shipping and Handling Costs	1,400	900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 0
Earnings Per Share, Basic and Diluted, Total (in dollars per share)	$ 0	$ 0
Operating Lease, Liability, Total	$ 689,597
Lessee, Operating Lease, Liability, to be Paid, Total	$ 840,000
Operating Lease, Weighted Average Discount Rate, Percent	5.00%
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 771,098
Lessee, Operating Lease, Liability, to be Paid, Total			$ 967,344
Operating Lease, Weighted Average Discount Rate, Percent			5.00%
Maximum [Member]
Product Warranty Expense	$ 2,000
Property, Plant and Equipment, Useful Life (Year)	7 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Electronic Products [Member]
Warranty Term (Day)	90 days
Electronic Controllers for Spas and Hot Tubs [Member]
Warranty Term (Day)	5 years

Represents the amount of shipping and handling costs incurred during the period.

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- Definition

The terms of a warranty.

+ References

No definition available.

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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No definition available.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 15
-Subparagraph (c)
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