Note 8 - Income Taxes (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	36 Months Ended
	Nov. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2011	Dec. 31, 2006	Jun. 30, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total				73.90%	(2.80%)
VAT and Withholding Taxes							$ 800,000
Interest Penalty Percentage							20.00%
Payments for Good Faith Deposits to Local Tax Authority Under Tax Agency's Adminstrative Judicial Resolution Process						$ 173,000
Loss Contingency Accrual, Ending Balance		$ 165,200		$ 165,200
Income Tax Expense (Benefit), Total		86,000	$ 8,000	197,000	$ 48,000
Foreign Tax Authority [Member] | Tax Periods of Years 2005 Through 2006 [Member]
Income Taxes Paid	$ 164,000
Foreign Tax Authority [Member] | Tax Year 2017 [Member]
Income Taxes Paid		96,000
Income, VAT, and Withholding Taxes								$ 217,000
General Taxes Expense		55,000		55,000
Income Tax Examination, Interest Expense		16,000		16,000
Income Tax Expense (Benefit), Total		$ 25,000		$ 25,000
Reserve for Tax Deficiencies of Subsidiaries [Member]
Loss Contingency Accrual, Ending Balance									$ 172,500