Note 13 - Related Party Transactions (Details Textual) - Skywords Note [Member] - Unsecured Subordinated Loan [Member] - USD ($)		6 Months Ended
Apr. 30, 2019	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019
Debt Instrument, Face Amount	$ 1,500,000	$ 1,500,000	$ 1,500,000	$ 1,500,000
Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%	1.00%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant