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Note 7 - Notes Payable (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 28, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 27, 2018
Proceeds from Notes Payable, Total					$ 50,000
Interest Expense, Total		$ 1,093	$ 625	2,221	833
Term Notes [Member]
Debt Instrument, Face Amount						$ 250,000
Senior Notes [Member]
Debt Instrument, Term	5 years
Proceeds from Notes Payable, Total	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year		6,250		6,250
Long-term Debt, Maturities, Repayments of Principal in Year Two		12,500		12,500
Long-term Debt, Maturities, Repayments of Principal in Year Three		12,500		12,500
Long-term Debt, Maturities, Repayments of Principal in Year Four		12,500		12,500
Long-term Debt, Maturities, Repayments of Principal in Year Five		2,083		2,083
Interest Expense, Total		$ 586	$ 625	$ 1,207	$ 833

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