Note 2 - Significant Accounting Polices - Reconciliation of Cash and Restricted Cash (Details) - USD ($)	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Cash	$ 1,573,000	$ 1,329,000		$ 1,407,000
Restricted Cash		65,000
Cash and restricted cash at beginning of period	$ 1,573,000	$ 1,394,000	$ 1,763,000	$ 1,407,000