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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Class A [Member]
Retained Earnings [Member]
Common Class A [Member]
AOCI Attributable to Parent [Member]
Common Class A [Member]
Common Stock, Common Class A [Member]
Common Class A [Member]
Common Stock, Common Class B [Member]
Common Class A [Member]
Treasury Stock [Member]
Common Class A [Member]
Additional Paid-in Capital [Member]
Common Class A [Member]
Common Class B [Member]
Retained Earnings [Member]
Common Class B [Member]
AOCI Attributable to Parent [Member]
Common Class B [Member]
Common Stock, Common Class A [Member]
Common Class B [Member]
Common Stock, Common Class B [Member]
Common Class B [Member]
Treasury Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
Common Class B [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Common Stock, Common Class A [Member]
Common Stock, Common Class B [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Total
Balance at Dec. 31, 2020                             $ 166,491 $ (18,063) $ 214 $ 1,021   $ 36,136 $ 185,799
Net earnings                             3,199 0 0 0   0 3,199
Cash dividends declared on common stock $ (128) $ 0 $ 0 $ 0   $ 0 $ (128) $ (716) $ 0 $ 0 $ 0   $ 0 $ (716)              
Forfeiture of restricted common stock                             0 0 0 (1)     0
Forfeiture of restricted common stock, APIC                                       1  
Foreign currency translation adjustment, net of taxes                             0 (2,529) 0 0   0 (2,529)
Stock-based compensation expense                             0 0 0 0   600 600
Change in unfunded SERP liability, net of taxes                             0 99 0 0   0 99
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented                             0 (1) 0 0   0 (1)
Balance at Mar. 31, 2021                             168,846 (20,494) 214 1,020   36,737 186,323
Unrealized holding losses on marketable securities                             0 (1) 0 0   0 (1)
Balance at Dec. 31, 2020                             166,491 (18,063) 214 1,021   36,136 185,799
Net earnings             1,822             9,258             11,080
Cash dividends declared on common stock             (257)             (1,430)              
Foreign currency translation adjustment, net of taxes                                         11
Change in unfunded SERP liability, net of taxes                                         199
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented                                         (1)
Balance at Jun. 30, 2021                             175,883 (17,854) 214 1,027   37,328 196,598
Unrealized holding losses on marketable securities                                         (1)
Balance at Mar. 31, 2021                             168,846 (20,494) 214 1,020   36,737 186,323
Net earnings             1,299             6,581 7,880 0 0 0   0 7,880
Cash dividends declared on common stock (129) 0 0 0   0 (129) (714) 0 0 0   0 (714)              
Forfeiture of restricted common stock                             0 0 0 (1)     0
Forfeiture of restricted common stock, APIC                                       1  
Foreign currency translation adjustment, net of taxes                             0 2,540 0 0   0 2,540
Stock-based compensation expense                             0 0 0 0   598 598
Change in unfunded SERP liability, net of taxes                             0 100 0 0   0 100
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented                                         0
Balance at Jun. 30, 2021                             175,883 (17,854) 214 1,027   37,328 196,598
Unrealized holding losses on marketable securities                                         0
Issuance of restricted common stock                             0 0 0 8   (8) 0
Balance at Dec. 31, 2021                             187,935 (18,863) 214 1,038 $ 0 38,419 208,743
Net earnings                             5,064 0 0 0 0 0 5,064
Cash dividends declared on common stock (129) 0 0 0 $ 0 0 (129) (727) 0 0 0 $ 0 0 (727)              
Forfeiture of restricted common stock                             0 0 0 (1)     0
Forfeiture of restricted common stock, APIC                                     0 1  
Foreign currency translation adjustment, net of taxes                             0 (1,216) 0 0 0 0 (1,216)
Unrealized gains on interest rate swap cash flow hedge                             0 2,984 0 0 0 0 2,984
Stock-based compensation expense                             0 0 0 0 0 576 576
Change in unfunded SERP liability, net of taxes                             0 61 0 0 0 0 61
Balance at Mar. 31, 2022                             192,143 (17,034) 214 1,037 0 38,996 215,356
Balance at Dec. 31, 2021                             187,935 (18,863) 214 1,038 0 38,419 208,743
Net earnings             3,614             18,488             22,102
Cash dividends declared on common stock             (258)             (1,453)              
Foreign currency translation adjustment, net of taxes                                         (7,980)
Change in unfunded SERP liability, net of taxes                                         122
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented                                         (12)
Balance at Jun. 30, 2022                             208,326 (22,741) 214 1,036 (349) 39,509 225,995
Unrealized holding losses on marketable securities                                         (12)
Balance at Mar. 31, 2022                             192,143 (17,034) 214 1,037 0 38,996 215,356
Net earnings             2,793             14,245 17,038 0 0 0 0 0 17,038
Cash dividends declared on common stock $ (129) $ 0 $ 0 $ 0 $ 0 $ 0 $ (129) $ (726) $ 0 $ 0 $ 0 $ 0 $ 0 $ (726)              
Forfeiture of restricted common stock                             0 0 0 (1)     0
Forfeiture of restricted common stock, APIC                                     0 1  
Foreign currency translation adjustment, net of taxes                             0 (6,764) 0 0 0 0 (6,764)
Unrealized gains on interest rate swap cash flow hedge                             0 1,008 0 0 0 0 1,008
Stock-based compensation expense                             0 0 0 0 0 512 512
Change in unfunded SERP liability, net of taxes                             0 61 0 0 0 0 61
Repurchase of treasury stock                             0 0 0 0 (349) 0 (349)
Unrealized holding losses on marketable securities, net of taxes of $0 in all periods presented                             0 (12) 0 0 0 0 (12)
Balance at Jun. 30, 2022                             208,326 (22,741) 214 1,036 (349) 39,509 225,995
Unrealized holding losses on marketable securities                             $ 0 $ (12) $ 0 $ 0 $ 0 $ 0 $ (12)