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Note 4 - Debts and Commitments - Future Obligations (Details)
Sep. 30, 2020
USD ($)
Payments due by Fiscal Year One $ 129,000
Payments due by Fiscal Year Two 11,000
Payments due by Fiscal Year Three 0
Payments due by Fiscal Year Four 0
Payments due by Fiscal Year Five 0
Payments due by Fiscal Year After Year Five 0
Payments due by Fiscal Year Total 140,000
Payments due by Fiscal Year One 270,000
Payments due by Fiscal Year Two 593,000
Payments due by Fiscal Year Three 344,000
Payments due by Fiscal Year Four 373,000
Payments due by Fiscal Year Five 324,000
Payments due by Fiscal Year After Year Five 1,400,000
Payments due by Fiscal Year Total 3,304,000
Real Estate Loan [Member]  
Payments due by Fiscal Year One 131,000
Payments due by Fiscal Year Two 148,000
Payments due by Fiscal Year Three 153,000
Payments due by Fiscal Year Four 158,000
Payments due by Fiscal Year Five 164,000
Payments due by Fiscal Year After Year Five 955,000
Payments due by Fiscal Year Total 1,709,000
Long Term Accrued Liabilities [Member]  
Payments due by Fiscal Year One 10,000 [1]
Payments due by Fiscal Year Two 434,000 [1]
Payments due by Fiscal Year Three 191,000 [1]
Payments due by Fiscal Year Four 215,000 [1]
Payments due by Fiscal Year Five 160,000 [1]
Payments due by Fiscal Year After Year Five 445,000 [1]
Payments due by Fiscal Year Total $ 1,455,000 [1]
[1] The long-term accrued liabilities for the Management Incentive Plan are discounted to the present value using a discount rate of 6%.