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Note 18 - Subsequent Events (Details Textual) - USD ($)		3 Months Ended			6 Months Ended
Note 18 - Subsequent Events (Details Textual) - USD ($)	Oct. 02, 2018	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Nov. 12, 2018
Stock Repurchased and Retired During Period, Shares			675
Stock Repurchased and Retired During Period, Value			$ 23,000		$ (22,759)
Other than Temporary Impairment Losses, Investments, Total						$ 771,173
Revolving Credit Facility [Member] \| MBT [Member] \| Credit Agreement Amendment [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 10,000,000		$ 10,000,000
Scenario, Forecast [Member] \| Investment in Oxbridge RE NS [Member]
Other than Temporary Impairment Losses, Investments, Total		$ 1,100,000
Subsequent Event [Member]
Stock Repurchased and Retired During Period, Shares	15,000
Stock Repurchased and Retired During Period, Value	$ 503,000
Subsequent Event [Member] \| Revolving Credit Facility [Member] \| MBT [Member] \| Credit Agreement Amendment [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 13,000,000