Note 3 - Income Taxes - Operating Loss Carryforwards (Details)	Sep. 30, 2019 USD ($)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward	$ 20,900,000
Operating Loss Carryforward, No Expiration	2,500,000
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	11,100,000
Domestic Tax Authority [Member] | Expires at Fiscal Year Ended September 30, 2039 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward	7,700,000
Operating Loss Carryforward, No Expiration
State and Local Jurisdiction [Member] | Other State [Member]
Operating Loss Carryforward	3,800,000
Operating Loss Carryforward, No Expiration
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	6,300,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2038 [Member] | Other State [Member]
Operating Loss Carryforward	2,000,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2039 [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforward	700,000
State and Local Jurisdiction [Member] | Expires at Fiscal Year Ended September 30, 2039 [Member] | Other State [Member]
Operating Loss Carryforward	$ 300,000