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Note 9 - Incentive Plans (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2010 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 42,300 | 186,200 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 14,133 | 2,250 |
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 68 | $ 268 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 335 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 2 years 146 days |  |
Equity Appreciation Right Units [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 108 | $ 0 |
Stock Incentive Plan 2017 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 42,300 | 186,200 |
Equity Appreciation Rights Plan 2010 [Member] | Equity Appreciation Right Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Redemption Cash Payment Period (Day) | 90 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  | 0 | 100,000 |
Equity Appreciation Rights Plan 2010 [Member] | Equity Appreciation Right Units [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 1,000,000 |  |  |

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