Note 9 - Related Party Transaction (Details Textual) - ISC Properties LLC [Member] - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction, Expenses from Transactions with Related Party	$ 214,000	$ 210,000
Chief Executive Officer [Member]
Related Party Ownership Percentage	100.00%

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration