NOTES PAYABLE AND LINE OF CREDIT - Long-term debt (Parentheticals) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021
Nodaway Valley Bank: $350,000 line-of-credit agreement expiring on January 4, 2022, with a variable interest rate at prime but not less than 5%. The line-of-credit is collateralized by substantially all assets of the Company.
Debt Instrument [Line Items]
Line-of-credit agreement, amount	$ 350,000	$ 350,000
Line of Credit Facility, Expiration date	Jan. 04, 2022	Jan. 04, 2022
Interest rate	5.00%	5.00%
Toyota Credit: $444 monthly payments, interest of 6.49%; final payment due May 2022, secured by a vehicle.
Debt Instrument [Line Items]
Line-of-credit agreement, amount	$ 444	$ 444
Line of Credit Facility, Expiration date	May 01, 2022	May 01, 2022
Interest rate	6.49%	6.49%