NOTES PAYABLE AND LINE OF CREDIT - Long-term debt (Parentheticals) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Nodaway Valley Bank: $350,000 line-of-credit agreement expiring on January 4, 2020, 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, 2020	Jan. 04, 2020
Interest rate, description	variable interest rate at prime	variable interest rate at prime
Line of credit facility, Basis for measurement	prime	prime
Basis Spread on Variable Rate	5.00%	5.00%
Ford Credit: $705 monthly payments, interest of 5.8%; final payment due October 2021, secured by a vehicle.
Debt Instrument [Line Items]
Notes payable, periodic payment	$ 705	$ 705
Notes payable, frequency	monthly	monthly
Interest rate	5.80%	5.80%
Maturity date	Oct. 31, 2021	Oct. 31, 2021
Toyota Credit $364 monthly payments, interest of 3.5%; final payment due December 2020, secured by a vehicle.
Debt Instrument [Line Items]
Notes payable, periodic payment	$ 364	$ 364
Notes payable, frequency	monthly	monthly
Interest rate	3.50%	3.50%
Maturity date	Dec. 31, 2020	Dec. 31, 2020