Note 6 - Land Purchases and Sales - Company Interest in Acres, Land, Timber, and Mineral Rights (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) a	Dec. 31, 2017 USD ($) a	Sep. 30, 2017 USD ($) a	Mar. 31, 2017 USD ($) a	Sep. 30, 2018 a
Land Located in Calcasieu, Louisiana [Member]
Acres (Acre) | a	17	0.4	2	1
Land Sold, Ownership Percentage	100.00%	100.00%	16.70%	100.00%
Mineral Rights, Percent	0.00%	0.00%	0.00%	0.00%
Land Located in Calcasieu, Louisiana [Member] | Land [Member]
Sold property | $	$ 128,000	$ 3,914	$ 888	$ 3,390
Second Land Located in Calcasieu Louisiana [Member]
Acres (Acre) | a	20		44		44
Land Sold, Ownership Percentage	16.70%		16.70%
Mineral Rights, Percent	0.00%		50.00%
Second Land Located in Calcasieu Louisiana [Member] | Land [Member]
Sold property | $	$ 147,625		$ 31,196
Third Land Located in Calcasieu Louisiana [Member]
Acres (Acre) | a	211
Land Sold, Ownership Percentage	16.70%
Mineral Rights, Percent	100.00%
Third Land Located in Calcasieu Louisiana [Member] | Land [Member]
Sold property | $	$ 536,572
Fourth Land Located in Calcasieu Louisiana [Member]
Acres (Acre) | a	76
Land Sold, Ownership Percentage	16.70%
Mineral Rights, Percent	0.00%
Fourth Land Located in Calcasieu Louisiana [Member] | Land [Member]
Sold property | $	$ 189,167