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Note 3 - Income Taxes - Summary of the Difference Between Statutory Federal Income Tax Rate and Effective Rate (Details)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Statutory federal income tax rate 34.00% 34.00% 34.00%
State franchise taxes (net of federal tax benefit) 6.20% 5.20% (23.30%)
State enterprise zone benefits 134.90%
Business meals/gifts (0.80%) (2.30%) (18.80%)
Domestic production activity deduction (2.20%)
Dividends received deduction 10.00% 24.50% 225.70%
Reversal of uncertain and unrecognized tax position 37.60%
Penalties for uncertain and unrecognized tax benefits 2.00%
Prior year true-up 1.00% (2.00%) (7.30%)
Foreign tax credits 2.00% 4.00% 28.40%
Effect of state rate change on beginning balance of deferred tax liabilities (0.30%) 1.40% (5.00%)
Others (3.00%) 0.20% (5.50%)
Effective tax rate 88.70% 65.00% 360.90%