Note 7 - Investments in Securities (Details Textual) - USD ($)		3 Months Ended
Apr. 01, 2018	Jun. 30, 2018
Equity Securities, FV-NI, Unrealized Gain		$ 61,000
Equity Securities, FV-NI, Unrealized Loss		$ 416,000
Debt Securities, Held-to-Maturity, Term		3 years
Debt Securities, Held-to-maturity, Total		$ 2,000,000
Accounting Standards Update 2016-01 [Member]
Adoption of ASU 2016-01, Reclassification from AOCI to Retained Earnings
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member]
Adoption of ASU 2016-01, Reclassification from AOCI to Retained Earnings	$ (106,000)	(106,341)
Accounting Standards Update 2016-01 [Member] \| AOCI Attributable to Parent [Member]
Adoption of ASU 2016-01, Reclassification from AOCI to Retained Earnings	$ 106,000	$ 106,341

Represents the amount reclassified from AOCI to retained earnings from the adoption of ASU 2016-01.

No definition available.

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- Definition

Represents the period of the investment in debt security, 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 of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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- Definition

Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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