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Note 7 - Stock-Based Compensation and Other Plans (Details Textual) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
May 15, 2019 | May 02, 2018 | Mar. 31, 2019 | Mar. 31, 2018
The 2018 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 325,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total |  |  | 0 |
The 2018 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 46,000 | $ 43,000
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 11,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | 365,000 |
The 2018 Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 3,000 | 6,000
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 1,000 | $ 2,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 2,000 |
The 2018 Plan [Member] | Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 15,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total | 310,000 |  |  |
The 2008 Plan [Member] |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Remaining for Grant Awards Cancelled |  | 345,750 |  |

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- Definition Represents the number of remaining-for-grant awards cancelled on a certain date or during a certain date range. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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