Note 3 - Income Taxes - Operating Loss Carryforwards (Details)	Sep. 30, 2018 USD ($)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward	$ 18,500,000
Domestic Tax Authority [Member] | Expires at Fiscal Year Ended September 30, 2036 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward	800,000
Domestic Tax Authority [Member] | Expires at Fiscal Year Ended September 30, 2037 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward	6,500,000
Domestic Tax Authority [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward	11,200,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward	6,200,000
State and Local Jurisdiction [Member] | Other State [Member]
Operating Loss Carryforward	4,300,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2036 [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2036 [Member] | Other State [Member]
Operating Loss Carryforward
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2037 [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward	700,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2037 [Member] | Other State [Member]
Operating Loss Carryforward	1,500,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward	5,500,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member] | Other State [Member]
Operating Loss Carryforward	$ 2,800,000