Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	[1]
Trade accounts receivable, allowance	$ 8	$ 8
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, issued (in shares)	10,418,953	10,312,653
Common stock, outstanding (in shares)	10,418,953	10,312,653
Series A Preferred Stock [Member]
Preferred stock, authorized (in shares)	250,000	250,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Series B, C, and D Preferred Stock [Member]
Preferred stock, authorized (in shares)	19,500	19,500
Preferred stock, issued (in shares)	18,533.51	18,533.51
Preferred stock, outstanding (in shares)	18,533.51	18,533.51
Preferred stock, liquidation preference	$ 3,540	$ 3,540
Series E Preferred Stock [Member]
Preferred stock, authorized (in shares)	60,000	60,000
Preferred stock, issued (in shares)	53,400	43,800
Preferred stock, outstanding (in shares)	53,400	43,800
Preferred stock, liquidation preference	$ 2,003	$ 1,643

[1] Derived from the audited consolidated financial statements as of and for the fiscal year ended March 31, 2018.