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Note 10 - Share-based Compensation (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Sep. 30, 2019
Share-based Payment Arrangement, Expense | $ 100 | $ 800 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 800 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years |  |  |
Share-based Payment Arrangement, Amount Capitalized | $ 0 | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Contractual Term | 10 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 49,188 |  |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance |  |  |  | 0
Independent Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |
Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 |
Stock Option Plan 1992 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,461,475 |  |  |

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- Definition Contractual term for option awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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