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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Mar. 31, 2016
Number of Operating Segments     4   4
Number of Physical Locations in Which Entity is Organized     8    
Income Tax Expense (Benefit) $ 628,000 $ 854,000 $ 1,721,000 $ 2,592,000  
Net Income (Loss) Available to Common Stockholders, Basic $ 3,252,000 $ 2,597,000 $ 7,540,000 $ 7,178,000  
Earnings Per Share, Basic | $ / shares $ 0.88 $ 0.72 $ 2.06 $ 2  
Earnings Per Share, Diluted | $ / shares $ 0.84 $ 0.69 $ 1.97 $ 1.91  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 2,618,000 $ 750,000 $ 6,771,000 $ 5,962,000  
Increase (Decrease) in Accrued Liabilities     $ (4,401,000) (49,000)  
Scenario, Previously Reported [Member]          
Income Tax Expense (Benefit)   1,090,000   3,351,000  
Net Income (Loss) Available to Common Stockholders, Basic   $ 2,361,000   $ 6,419,000  
Earnings Per Share, Basic | $ / shares   $ 0.65   $ 1.79  
Earnings Per Share, Diluted | $ / shares   $ 0.63   $ 1.72  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 514,000   $ 5,203,000  
Increase (Decrease) in Accrued Liabilities       $ 710,000