Amount, before allowance for credit loss, of financing receivable, classified as current.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Note 10 - Subsequent Events (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
Note 10 - Subsequent Events (Details Textual) - USD ($)	May 13, 2019	Mar. 31, 2019	Mar. 31, 2018
Proceeds from Collection of Notes Receivable		$ 840,000
New Note [Member]
Proceeds from Collection of Notes Receivable		$ 643,000
Subsequent Event [Member] \| New Note [Member]
Proceeds from Collection of Notes Receivable	$ 126,000
Financing Receivable, before Allowance for Credit Loss, Current	$ 3,570,000