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Note 10 - Stock Ownership Plans (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Sep. 30, 2018	Sep. 24, 2017
Share-based Payment Arrangement, Expense		$ 1,638,000	$ 1,857,000	$ 2,088,000
Common Stock, Capital Shares Reserved for Future Issuance		2,805,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 179,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		10 years
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 0
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 1,350,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		1 year 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		788,000	587,000	837,000
Restricted Stock [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	724,300
Employee Stock Purchase Plan [Member]
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total		270,000
Supplemental Employee Stock Purchase Plan [Member]
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total		8,700

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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