Note 5 - Land Purchases and Sales - Company Interest in Acres, Land, Timber, and Mineral Rights (Details)	3 Months Ended
	Jun. 30, 2019 USD ($) a	Mar. 31, 2019 USD ($) a	Mar. 31, 2018 USD ($) a
Land Located in Calcasieu, Louisiana [Member]
Acres (Acre) | a	20	16.26	17
Land Sold, Ownership Percentage	16.67%	100.00%	100.00%
Mineral Rights, Percent	0.00%	0.00%	0.00%
Land Located in Calcasieu, Louisiana [Member] | Land [Member]
Sold property	$ 5,000	$ 112,500	$ 128,000
Land Located in Calcasieu, Louisiana [Member] | Timber Properties [Member]
Sold property
Second Land Located in Calcasieu Louisiana [Member]
Acres (Acre) | a			20
Land Sold, Ownership Percentage			16.70%
Mineral Rights, Percent			0.00%
Second Land Located in Calcasieu Louisiana [Member] | Land [Member]
Sold property			$ 147,625
Second Land Located in Calcasieu Louisiana [Member] | Timber Properties [Member]
Sold property
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
Third Land Located in Calcasieu Louisiana [Member] | Timber Properties [Member]
Sold property
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
Fourth Land Located in Calcasieu Louisiana [Member] | Timber Properties [Member]
Sold property