Note 11 - Subsequent Event (Details Textual) - $ / shares	Jan. 07, 2019	Dec. 31, 2018	Jun. 30, 2018
Subsequent Event [Member] | The Bank [Member]
Business Combination, Number of Share Received Per Share of Stock Held	1
Voting Common Stock [Member]
Common Stock, Par or Stated Value Per Share		$ 1	$ 1
Voting Common Stock [Member] | Subsequent Event [Member]
Common Stock, Par or Stated Value Per Share	$ 1
Nonvoting Common Stock [Member]
Common Stock, Par or Stated Value Per Share		$ 1	$ 1
Nonvoting Common Stock [Member] | Subsequent Event [Member]
Common Stock, Par or Stated Value Per Share	$ 1