Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2019
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 0
Income Tax Expense (Benefit), Total	358	$ 214
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	$ 942	$ 640
Effective Income Tax Rate Reconciliation, Percent, Total	38.00%	33.40%
Decrease in Tax Expense related to Benefit of Loss Carryforward		$ 100
Deferred Tax Assets, Valuation Allowance, Total	$ 0
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Unrecognized Tax Benefits, Ending Balance	$ 200
Scenario, Forecast [Member]
Additional Tax Rate On Foreign Income			1050.00%
Effective Income Tax Rate, Reconcilation Effected by GILTI, Estimate Increase			600.00%