Note 2 - Summary of Significant Accounting Policies 1 (Details Textual) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 21, 2018 shares
Unbilled Receivables, Current	$ 900			$ 900		$ 800
Contract with Customer, Liability, Revenue Recognized	3,800			3,800		8,900
Amortization of Deferred Sales Commissions	$ 200		$ 200	600	$ 600
Capitalized Contract Cost, Impairment Loss		$ 0	$ 0	$ 0	$ 0
December Notes Warrants [Member] | Investors [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares							10,500,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Number of Major Customers	0		0	0	0
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	0		0	0	0
Subscription Contracts [Member]
Revenue, Remaining Performance Obligation, Amount	$ 20,500			$ 20,500
Professional Services [Member]
Revenue, Remaining Performance Obligation, Amount	1,200			1,200
Deferred Commissions [Member] | Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net, Current, Total	$ 400			$ 400		$ 500