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Note 8 - Incentive Plans (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 03, 2005 | May 31, 2017 | Nov. 30, 2010 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 186,200 | 134,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 2,250 | 0
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 268 | $ 126
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 365 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 328 days |
Equity Appreciation Right Units [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 0
The 2003 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Eliminated | 172,500 |  |  |  |
The 2005 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 200,000 |  |  |  |
Stock Incentive Plan 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 400,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 186,200 | 134,000
Stock Incentive Plan 2017 [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 100.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Exercisable Term |  | 1 year |  |  |
Stock Incentive Plan 2017 [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |
Equity Appreciation Rights Plan 2010 [Member] | Equity Appreciation Right Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Redemption Cash Payment Period |  |  | 90 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  |  |  | 100,000 | 0
Equity Appreciation Rights Plan 2010 [Member] | Maximum [Member] | Equity Appreciation Right Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 1,000,000 |  |

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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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