Note 4 - Loans - Secured Loans Past Maturity (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Maximum [Member] \| Past Maturity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan-to-value ratio percentage	50.00%	50.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration