Note 2 - Significant Accounting Polices - Reconciliation of Cash and Restricted Cash (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Cash	$ 840,000	$ 1,329,000
Restricted cash		65,000
Cash and restricted cash at beginning of year	840,000	1,394,000	$ 1,407,000
Cash	2,417,000	840,000	1,329,000
Restricted cash			65,000
Cash and restricted cash at end of year	$ 2,417,000	$ 840,000	$ 1,394,000