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Note 3 - Income Taxes (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |  |  |  |  | 24.28% | 35.00% | 34.00% | 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  |  |  |  |  | $ (16,000,000) |  |  |
Income Tax Expense (Benefit), Continuing Operations, Revaluation Differences in Deferred Taxes |  |  |  |  |  |  |  |  |  | (20,000,000) |  |  |
Income Tax Expense (Benefit), Total |  | $ (1,880,000) | $ (710,000) | $ (100,000) | $ (16,850,000) | $ (1,135,000) | $ (1,465,000) | $ (4,240,000) | $ (310,000) | (19,540,000) |  | $ (7,150,000) | $ (1,935,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total |  |  |  |  |  | (2,210,000) | $ (2,816,000) | $ (1,261,000) | $ (1,781,000) | $ (11,339,000) |  | (8,068,000) | $ (2,978,000)
Liability For Uncertain Tax Positions, Reversal |  |  |  |  |  | 2,665,000 |  |  |  |  |  | 2,665,000 |
Unrecognized Tax Benefits, Accumulated Reduction |  |  |  |  |  | $ 743,000 |  |  |  |  |  | 743,000 |
Deferred Tax Liability, Reversal |  |  |  |  |  |  |  |  |  |  |  | $ 352,000 |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  |  |  |  |  |  |  | 172.30% |  | 88.70% | 65.00%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 18,500,000 |  |  |  |  |  |  |  | $ 18,500,000 |  |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  |  |  |  |  |  |  | 2015 |  |  |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | 6,200,000 |  |  |  |  |  |  |  | $ 6,200,000 |  |  |
State and Local Jurisdiction [Member] | Other State [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Total |  | $ 4,300,000 |  |  |  |  |  |  |  | $ 4,300,000 |  |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  |  |  |  |  |  |  | 2013 |  |  |

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