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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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The amount of deferred tax liabilities that were reversed during the period.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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