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Note 15 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended 37 Months Ended
Jan. 04, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 31, 2019
Labor and Related Expense   $ 13,681,000 $ 11,741,000 $ 10,915,000  
Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 306,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 40 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)     1,404 6,600  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)   19,995 10,999 7,878  
2012 Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   3,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   2,860,438      
Share-based Payment Arrangement, Expense   $ 214,000 $ 220,000 $ 146,000  
2012 Stock Plan [Member] | Employee [Member]          
Share-based Payment Arrangement, Expense   117,000 135,000 68,000  
2012 Stock Plan [Member] | Patriot's External Directors [Member]          
Share-based Payment Arrangement, Expense   97,000 85,000 78,000  
Labor and Related Expense   $ 547,000 $ 370,000 $ 318,000  
2012 Stock Plan [Member] | Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)   0      
2012 Stock Plan [Member] | Restricted Stock [Member] | Non-executive Employees [Member]          
Stock Granted During Period, Shares, Gross Per Employee (in shares) 100        
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) 8,700        
Share Price (in dollars per share) $ 15.50        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)         2,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         6,000
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years      
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Three [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   5 years