Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member]
|1 Months Ended|
Apr. 24, 2018
|Treasury Stock, Shares, Acquired | shares||500,000|
|Stock Repurchase Program, Authorized Amount||$ 2,000,000|
|Stock Repurchase Program, Remaining Authorized Repurchase Amount||$ 3,000,000|
Number of shares that have been repurchased during the period and are being held in treasury.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef