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Note 10 - Subsequent Events	6 Months Ended
Note 10 - Subsequent Events	Sep. 30, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 10. SUBSEQUENT EVENTS On October 17, 2018 we announced that our Board had declared a quarterly cash dividend of $1.00 per share of Common Stock to be paid November 30, 2018 to shareholders of record as of the close of business October 29, 2018 .