Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jan. 31, 2021	Oct. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 144,000	$ 144,000
Accumulated depreciation, machinery and equipment	7,763,417	7,610,864
Customer list and relationships, accumulated amortization	205,067	194,379
Non-compete, accumulated amortization	$ 54,450	$ 49,500
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	6,633,930	6,633,930
Common stock, shares outstanding	5,708,599	5,708,599
Treasury stock, shares	925,331	925,331